{"id":18336,"date":"2026-07-18T22:31:21","date_gmt":"2026-07-18T13:31:21","guid":{"rendered":"https:\/\/genai-ai.co.jp\/ai-kanri\/?p=18336"},"modified":"2026-07-18T22:31:21","modified_gmt":"2026-07-18T13:31:21","slug":"cc-css-background","status":"publish","type":"post","link":"https:\/\/genai-ai.co.jp\/ai-kanri\/blog\/cc-css-background\/","title":{"rendered":"\u30102026\u5e747\u6708\u6700\u65b0\u3011CSS background-color\u5b8c\u5168\u30ac\u30a4\u30c9\uff5c\u80cc\u666f\u8272\u306e\u6307\u5b9a\u30fbhover\u30fb\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u30fb\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u307e\u3067\u5fb9\u5e95\u89e3\u8aac"},"content":{"rendered":"\n<style>\n.g-flow-row{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;align-items:center;}\n.g-flow-item{background:linear-gradient(135deg,#1a1a1a,#2a1015);color:#fff;border-radius:8px;padding:16px 14px;min-width:130px;flex:1;text-align:center;}\n.g-flow-arrow{color:#dc2626;font-size:20px;font-weight:700;}\n.g-card-row{display:flex;gap:12px;flex-wrap:wrap;margin:0 0 32px;}\n.g-card-row>div{flex:1;min-width:220px;}\n@media(max-width:600px){\n  .g-flow-row{flex-direction:column;}\n  .g-flow-arrow{transform:rotate(90deg);}\n  .g-card-row{flex-direction:column;}\n  .g-card-row>div{min-width:100%;}\n}\n<\/style>\n\n\n\n<div style=\"margin:0 0 32px;\">\n  <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/07\/thumb-cc-css-background.jpg\" alt=\"CSS background-color\u5b8c\u5168\u30ac\u30a4\u30c9\" style=\"width:100%;height:auto;border-radius:12px;display:block;\">\n<\/div>\n\n\n\n<div style=\"background:#f8f9fa;border-radius:12px;padding:24px 28px;margin:0 0 32px;border-left:4px solid #dc2626;\">\n  <p style=\"font-size:15px;font-weight:700;color:#1a1a1a;margin:0 0 16px;\">\u3053\u306e\u8a18\u4e8b\u306e\u5185\u5bb9<\/p>\n  <ol style=\"margin:0;padding-left:20px;font-size:14px;line-height:2.2;list-style:none;\">\n    <li><a href=\"#sec-01\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#dc2626;font-weight:700;margin-right:8px;\">01<\/span>background-color\u30d7\u30ed\u30d1\u30c6\u30a3\u3068\u306f<\/a><\/li>\n    <li><a href=\"#sec-02\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#dc2626;font-weight:700;margin-right:8px;\">02<\/span>\u30ab\u30e9\u30fc\u540d\u30fbHEX\u30fbRGB\u30fbHSL\u3067\u306e\u6307\u5b9a<\/a><\/li>\n    <li><a href=\"#sec-03\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#dc2626;font-weight:700;margin-right:8px;\">03<\/span>rgba()\u3067\u534a\u900f\u660e\u80cc\u666f\u3092\u4f5c\u308b<\/a><\/li>\n    <li><a href=\"#sec-04\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#dc2626;font-weight:700;margin-right:8px;\">04<\/span>\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\uff08background: linear-gradient\uff09\u3068\u306e\u9055\u3044<\/a><\/li>\n    <li><a href=\"#sec-05\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#dc2626;font-weight:700;margin-right:8px;\">05<\/span>\u30dc\u30c3\u30af\u30b9\u5168\u4f53\u3078\u306e\u80cc\u666f\u8272\u8a2d\u5b9a<\/a><\/li>\n    <li><a href=\"#sec-06\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#dc2626;font-weight:700;margin-right:8px;\">06<\/span>hover\u6642\u306b\u80cc\u666f\u8272\u3092\u5909\u3048\u308b\uff08:hover\uff09<\/a><\/li>\n    <li><a href=\"#sec-07\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#dc2626;font-weight:700;margin-right:8px;\">07<\/span>\u30bb\u30af\u30b7\u30e7\u30f3\u5225\u306e\u80cc\u666f\u8272\u3067\u30c7\u30b6\u30a4\u30f3\u306b\u30e1\u30ea\u30cf\u30ea<\/a><\/li>\n    <li><a href=\"#sec-08\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#dc2626;font-weight:700;margin-right:8px;\">08<\/span>\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u5bfe\u5fdc<\/a><\/li>\n    <li><a href=\"#sec-09\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#dc2626;font-weight:700;margin-right:8px;\">09<\/span>background-color\u3068background\u306e\u9055\u3044<\/a><\/li>\n    <li><a href=\"#sec-10\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#dc2626;font-weight:700;margin-right:8px;\">10<\/span>\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\uff08\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\uff09<\/a><\/li>\n    <li><a href=\"#sec-11\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#dc2626;font-weight:700;margin-right:8px;\">11<\/span>Claude Code\u3067\u30c6\u30fc\u30de\u30ab\u30e9\u30fc\u3092\u4e00\u62ec\u5909\u66f4<\/a><\/li>\n    <li><a href=\"#faq\" style=\"color:#495057;text-decoration:none;\"><span style=\"color:#dc2626;font-weight:700;margin-right:8px;\">FAQ<\/span>\u3088\u304f\u3042\u308b\u8cea\u554f<\/a><\/li>\n  <\/ol>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Web\u30b5\u30a4\u30c8\u3084\u30d6\u30ed\u30b0\u306e\u30c7\u30b6\u30a4\u30f3\u3067\u3001\u30bb\u30af\u30b7\u30e7\u30f3\u306e\u80cc\u666f\u3092\u5909\u3048\u305f\u3044\u30fb\u30dc\u30bf\u30f3\u306e\u80cc\u666f\u8272\u3092\u8a2d\u5b9a\u3057\u305f\u3044\u30fb\u30ab\u30fc\u30c9\u306b\u8272\u3092\u3064\u3051\u305f\u3044\u2014\u2014\u305d\u3093\u306a\u5834\u9762\u306f\u6bce\u65e5\u306e\u3088\u3046\u306b\u3042\u308a\u307e\u3059\u3002<br>CSS\u306b\u306f<strong>background-color\uff08\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u30ab\u30e9\u30fc\uff09<\/strong>\u3068\u3044\u3046\u3001\u8981\u7d20\u306e\u80cc\u666f\u8272\u3092\u81ea\u7531\u306b\u8a2d\u5b9a\u3067\u304d\u308b\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u300cCSS\u306e\u66f8\u304d\u65b9\u304c\u3088\u304f\u308f\u304b\u3089\u306a\u3044\u300d\u300c\u30ab\u30e9\u30fc\u30b3\u30fc\u30c9\u3063\u3066\u4f55\uff1f\u300d\u300cbackground\u3068background-color\u306e\u9055\u3044\u306f\uff1f\u300d<br>\u305d\u3093\u306a\u7591\u554f\u3092\u6301\u3063\u3066\u3044\u308b\u975e\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u65b9\u3067\u3082\u3001\u3053\u306e\u8a18\u4e8b\u3092\u8aad\u307f\u7d42\u3048\u308c\u3070<strong>background-color\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f7f\u3044\u3053\u306a\u305b\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30ab\u30e9\u30fc\u540d\u30fbHEX\u30fbRGB\u30fbRGBA\u30fbHSL\u306e5\u7a2e\u985e\u306e\u6307\u5b9a\u65b9\u6cd5\u304b\u3089\u3001hover\u6642\u306e\u8272\u5909\u5316\u30fb\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u3068\u306e\u9055\u3044\u30fb\u30bb\u30af\u30b7\u30e7\u30f3\u8a2d\u8a08\u30fb\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u5bfe\u5fdc\u30fb\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u30fbClaude Code\u306b\u3088\u308b\u4e00\u62ec\u5909\u66f4\u307e\u3067\u3001<br>\u73fe\u5834\u3067\u4f7f\u3048\u308b\u77e5\u8b58\u3092\u6bb5\u968e\u7684\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"balloon-wrap\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/ceo-sugasawa.jpg\" alt=\"\u4ee3\u8868\u83c5\u6fa4\">\n    <span class=\"balloon-name\">\u4ee3\u8868\u83c5\u6fa4<\/span>\n  <\/div>\n  <div class=\"balloon-body\">Web\u30b5\u30a4\u30c8\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u306b\u80cc\u666f\u8272\u3092\u3064\u3051\u308b\u3060\u3051\u3067\u3001\u60c5\u5831\u306e\u533a\u5207\u308a\u304c\u8996\u899a\u7684\u306b\u308f\u304b\u308a\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002\u305f\u3063\u305f1\u884c\u306eCSS\u3067\u898b\u305f\u76ee\u304c\u5287\u7684\u306b\u5909\u308f\u308b\u2014\u2014background-color\u306f\u305d\u3046\u3044\u3046\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u3059\u3002<\/div>\n<\/div>\n\n\n\n<div class=\"balloon-wrap is-right\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/yamazaki-avatar.png\" alt=\"AI\u9b3c\u7ba1\u7406\u5c71\u5d0e\">\n    <span class=\"balloon-name\">AI\u9b3c\u7ba1\u7406\u5c71\u5d0e<\/span>\n  <\/div>\n  <div class=\"balloon-body\">\u3053\u306e\u8a18\u4e8b\u306f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u672a\u7d4c\u9a13\u306e\u65b9\u3067\u3082\u8aad\u3081\u308b\u3088\u3046\u306b\u3001\u5177\u4f53\u7684\u306a\u30b3\u30fc\u30c9\u4f8b\u3068\u300c\u306a\u305c\u305d\u3046\u306a\u308b\u304b\u300d\u306e\u8aac\u660e\u3092\u305f\u3063\u3077\u308a\u5165\u308c\u307e\u3057\u305f\u3002\u30b3\u30fc\u30c9\u304c\u82e6\u624b\u306a\u65b9\u3082\u3001\u3086\u3063\u304f\u308a\u8aad\u3093\u3067\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/div>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-css-background&#038;blog_slug=cc-css-background\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-css-background&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-01\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">01<\/span>\n  <span class=\"section-label\" style=\"display:block;\">WHAT IS BG-COLOR<\/span>\n  <span class=\"section-title\" style=\"display:block;\">background-color\u30d7\u30ed\u30d1\u30c6\u30a3\u3068\u306f<\/span>\n  <span class=\"section-desc\">\u80cc\u666f\u8272\u3092\u8a2d\u5b9a\u3059\u308bCSS\u306e\u57fa\u672c\u30d7\u30ed\u30d1\u30c6\u30a3<\/span>\n<\/h2>\n\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #6b7280;border-radius:0 8px 8px 0;padding:16px 20px;margin:20px 0;\"><p style=\"margin:0 0 4px;font-size:13px;font-weight:700;color:#6b7280;letter-spacing:1px;\">&#128218; \u7528\u8a9e\u89e3\u8aac<\/p><p style=\"margin:0;font-size:15px;line-height:1.7;\"><strong>background-color\u30d7\u30ed\u30d1\u30c6\u30a3<\/strong>\uff1aHTML\u8981\u7d20\u306e\u80cc\u666f\u8272\u3092\u6307\u5b9a\u3059\u308bCSS\u30d7\u30ed\u30d1\u30c6\u30a3\u3002\u300cbackground-color: \u8272\u306e\u5024;\u300d\u306e\u5f62\u5f0f\u3067\u8a18\u8ff0\u3057\u3001\u8981\u7d20\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u9818\u57df\u3068\u30d1\u30c7\u30a3\u30f3\u30b0\u9818\u57df\u3092\u5857\u308a\u3064\u3076\u3057\u307e\u3059\u3002\u30c6\u30ad\u30b9\u30c8\u8272\u3092\u5909\u3048\u308bcolor\u30d7\u30ed\u30d1\u30c6\u30a3\u3068\u306f\u7570\u306a\u308a\u3001\u8981\u7d20\u306e\u80cc\u666f\uff08\u5f8c\u308d\u5074\uff09\u306e\u8272\u3092\u5909\u3048\u307e\u3059\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306ftransparent\uff08\u900f\u660e\uff09\u3067\u3001\u89aa\u8981\u7d20\u306e\u80cc\u666f\u304c\u900f\u3051\u3066\u898b\u3048\u308b\u72b6\u614b\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">CSS\u306e<strong>background-color\u30d7\u30ed\u30d1\u30c6\u30a3<\/strong>\u306f\u3001HTML\u8981\u7d20\u306e\u300c\u80cc\u666f\u300d\u306e\u8272\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002<br>\u6587\u5b57\u8272\u3092\u5909\u3048\u308bcolor\u30d7\u30ed\u30d1\u30c6\u30a3\u3068\u306f\u7570\u306a\u308a\u3001\u8981\u7d20\u306e\u300c\u5f8c\u308d\u5074\u300d\u306e\u8272\u3092\u5857\u308a\u3064\u3076\u3059\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u57fa\u672c\u7684\u306a\u66f8\u304d\u65b9\u306f\u3068\u3066\u3082\u30b7\u30f3\u30d7\u30eb\u3067\u3059\u3002\u30bb\u30ec\u30af\u30bf\u30fc\uff08\u5bfe\u8c61\u8981\u7d20\uff09\u306b\u5bfe\u3057\u3066\u300cbackground-color: \u8272;\u300d\u3068\u66f8\u304f\u3060\u3051\u3067\u80cc\u666f\u8272\u304c\u8a2d\u5b9a\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* \u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9 *\/\ndiv { background-color: #f8f9fa; }\nsection { background-color: rgba(220, 38, 38, 0.1); }\nbutton:hover { background-color: #dc2626; }<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u306e3\u884c\u3092\u898b\u3066\u304f\u3060\u3055\u3044\u3002<br>div\u8981\u7d20\u306e\u80cc\u666f\u3092\u8584\u3044\u30b0\u30ec\u30fc\uff08#f8f9fa\uff09\u306b\u8a2d\u5b9a\u3057\u3001<br>section\u8981\u7d20\u306e\u80cc\u666f\u3092\u8d64\u306e10%\u900f\u904e\u306b\u8a2d\u5b9a\u3057\u3001<br>button\u8981\u7d20\u306b\u30de\u30a6\u30b9\u304c\u4e57\u3063\u305f\u3068\u304d\uff08:hover\uff09\u306e\u80cc\u666f\u3092\u8d64\uff08#dc2626\uff09\u306b\u8a2d\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<br>\u3053\u308c\u3060\u3051\u3067Web\u30b5\u30a4\u30c8\u306e\u30c7\u30b6\u30a4\u30f3\u306b\u5927\u304d\u306a\u5909\u5316\u3092\u3082\u305f\u3089\u305b\u307e\u3059\u3002<\/p>\n\n\n\n<table>\n<thead><tr><th>\u30d7\u30ed\u30d1\u30c6\u30a3<\/th><th>\u5bfe\u8c61<\/th><th>\u30c7\u30d5\u30a9\u30eb\u30c8\u5024<\/th><th>\u4e3b\u306a\u7528\u9014<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>color<\/td><td>\u30c6\u30ad\u30b9\u30c8\uff08\u6587\u5b57\uff09\u306e\u8272<\/td><td>\u30d6\u30e9\u30a6\u30b6\u65e2\u5b9a\uff08\u9ed2\u7cfb\uff09<\/td><td>\u672c\u6587\u30fb\u898b\u51fa\u3057\u30fb\u30ea\u30f3\u30af\u306e\u6587\u5b57\u8272<\/td><\/tr>\n<tr><td>background-color<\/td><td>\u8981\u7d20\u306e\u80cc\u666f\u8272<\/td><td>transparent\uff08\u900f\u660e\uff09<\/td><td>\u30bb\u30af\u30b7\u30e7\u30f3\u80cc\u666f\u30fb\u30ab\u30fc\u30c9\u30fb\u30dc\u30bf\u30f3<\/td><\/tr>\n<tr><td>border-color<\/td><td>\u67a0\u7dda\u306e\u8272<\/td><td>currentColor<\/td><td>\u30dc\u30fc\u30c0\u30fc\u306e\u8272\u6307\u5b9a<\/td><\/tr>\n<tr><td>outline-color<\/td><td>\u30a2\u30a6\u30c8\u30e9\u30a4\u30f3\u306e\u8272<\/td><td>currentColor<\/td><td>\u30d5\u30a9\u30fc\u30ab\u30b9\u30ea\u30f3\u30b0\u30fb\u30c7\u30d0\u30c3\u30b0\u7528<\/td><\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">background-color\u304c\u5f71\u97ff\u3059\u308b\u7bc4\u56f2\u306f\u3001\u8981\u7d20\u306e<strong>\u30b3\u30f3\u30c6\u30f3\u30c4\u9818\u57df\u3068\u30d1\u30c7\u30a3\u30f3\u30b0\u9818\u57df<\/strong>\u3067\u3059\u3002<br>\u30de\u30fc\u30b8\u30f3\uff08margin\uff09\u306f\u900f\u660e\u306a\u307e\u307e\u3001\u30dc\u30fc\u30c0\u30fc\u306f\u5225\u9014border-color\u3067\u7ba1\u7406\u3055\u308c\u307e\u3059\u3002<br>\u3053\u306e\u300c\u3069\u3053\u307e\u3067\u5857\u3089\u308c\u308b\u304b\u300d\u3092\u7406\u89e3\u3057\u3066\u304a\u304f\u3068\u3001\u30ec\u30a4\u30a2\u30a6\u30c8\u5d29\u308c\u3092\u9632\u3052\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#f0fdf4;border:1px solid #22c55e;border-radius:8px;padding:20px 24px;margin:24px 0;\"><div style=\"display:flex;align-items:center;gap:8px;margin-bottom:12px;\"><span style=\"font-size:18px;\">&#128161;<\/span><strong style=\"color:#16a34a;font-size:15px;\">background-color\u306f\u7d99\u627f\u3055\u308c\u306a\u3044<\/strong><\/div><p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">color\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u89aa\u304b\u3089\u5b50\u3078\u7d99\u627f\u3055\u308c\u307e\u3059\u304c\u3001background-color\u306f\u7d99\u627f\u3055\u308c\u307e\u305b\u3093\u3002\u5404\u8981\u7d20\u306b\u500b\u5225\u306b\u6307\u5b9a\u3059\u308b\u304b\u3001\u80cc\u666f\u8272\u3092\u6301\u3064\u89aa\u306e\u4e2d\u306b\u914d\u7f6e\u3059\u308b\u3053\u3068\u3067\u8996\u899a\u7684\u306b\u898b\u305b\u307e\u3059\u3002\u5b50\u8981\u7d20\u306ebackground-color\u306f\u30c7\u30d5\u30a9\u30eb\u30c8transparent\uff08\u900f\u660e\uff09\u306a\u306e\u3067\u3001\u89aa\u306e\u80cc\u666f\u8272\u304c\u900f\u3051\u3066\u898b\u3048\u307e\u3059\u3002<\/p><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">background-color\u306f\u5358\u72ec\u3067\u4f7f\u3046\u3060\u3051\u3067\u306a\u304f\u3001padding\u30fbborder-radius\u30fbbox-shadow\u306a\u3069\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u30ab\u30fc\u30c9\u578b\u30c7\u30b6\u30a4\u30f3\u3084\u30cf\u30a4\u30e9\u30a4\u30c8\u30dc\u30c3\u30af\u30b9\u306a\u3069\u3001\u5e45\u5e83\u3044UI\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u4f5c\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#fafafa;border-radius:8px;padding:16px 20px;margin:16px 0;border-left:4px solid #dc2626;\">\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>\u8981\u7d20\u306e\u80cc\u666f\u8272\u3092\u8a2d\u5b9a\u3059\u308b\u57fa\u672c\u4e2d\u306e\u57fa\u672c\u30d7\u30ed\u30d1\u30c6\u30a3<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306ftransparent\uff08\u900f\u660e\uff09\u3067\u89aa\u306e\u80cc\u666f\u304c\u900f\u3051\u3066\u898b\u3048\u308b<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>\u30b3\u30f3\u30c6\u30f3\u30c4\u9818\u57df\uff0b\u30d1\u30c7\u30a3\u30f3\u30b0\u9818\u57df\u304c\u5857\u308a\u3064\u3076\u3055\u308c\u308b\uff08\u30de\u30fc\u30b8\u30f3\u306f\u542b\u307e\u306a\u3044\uff09<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>color\u30d7\u30ed\u30d1\u30c6\u30a3\uff08\u6587\u5b57\u8272\uff09\u3068\u306f\u5225\u3067\u72ec\u7acb\u3057\u3066\u8a2d\u5b9a\u3059\u308b<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>\u7d99\u627f\u3055\u308c\u306a\u3044\u306e\u3067\u5404\u8981\u7d20\u306b\u500b\u5225\u6307\u5b9a\u304c\u5fc5\u8981<\/span><\/div>\n<\/div>\n\n\n\n<div class=\"balloon-wrap\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/ceo-sugasawa.jpg\" alt=\"\u4ee3\u8868\u83c5\u6fa4\">\n    <span class=\"balloon-name\">\u4ee3\u8868\u83c5\u6fa4<\/span>\n  <\/div>\n  <div class=\"balloon-body\">background-color\u306f\u7d99\u627f\u3055\u308c\u306a\u3044\u2014\u2014\u3053\u308c\u3092\u6700\u521d\u306b\u899a\u3048\u3066\u304a\u304f\u3068\u300c\u306a\u305c\u5b50\u8981\u7d20\u306e\u80cc\u666f\u304c\u5909\u308f\u3089\u306a\u3044\u3093\u3060\u308d\u3046\u300d\u3068\u3044\u3046\u6df7\u4e71\u304c\u306a\u304f\u306a\u308a\u307e\u3059\u3002\u89aa\u306b\u8a2d\u5b9a\u3057\u3066\u3082\u5b50\u306b\u306f\u4f1d\u308f\u3089\u306a\u3044\u3001\u3068\u3044\u3046\u306e\u304c\u30eb\u30fc\u30eb\u3067\u3059\u3002<\/div>\n<\/div>\n\n\n\n<div class=\"balloon-wrap is-right\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/yamazaki-avatar.png\" alt=\"AI\u9b3c\u7ba1\u7406\u5c71\u5d0e\">\n    <span class=\"balloon-name\">AI\u9b3c\u7ba1\u7406\u5c71\u5d0e<\/span>\n  <\/div>\n  <div class=\"balloon-body\">\u300c\u8981\u7d20\u306e\u80cc\u666f\u8272\u3092\u5909\u3048\u305f\u3044\u306e\u306b\u6587\u5b57\u8272\u3092\u5909\u3048\u308b\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f7f\u3063\u3066\u3057\u307e\u3063\u305f\u300d\u3068\u3044\u3046\u9593\u9055\u3044\u3082\u3088\u304f\u3042\u308a\u307e\u3059\u3002background-color\u304c\u80cc\u666f\u3001color\u304c\u6587\u5b57\u8272\u3001\u3068\u533a\u5225\u3057\u3066\u899a\u3048\u3066\u304f\u3060\u3055\u3044\u3002<\/div>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-css-background&#038;blog_slug=cc-css-background\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-css-background&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-02\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">02<\/span>\n  <span class=\"section-label\" style=\"display:block;\">COLOR FORMATS<\/span>\n  <span class=\"section-title\" style=\"display:block;\">\u30ab\u30e9\u30fc\u540d\u30fbHEX\u30fbRGB\u30fbHSL\u3067\u306e\u6307\u5b9a<\/span>\n  <span class=\"section-desc\">4\u3064\u306e\u8272\u6307\u5b9a\u65b9\u6cd5\u3092\u4f7f\u3044\u3053\u306a\u3059<\/span>\n<\/h2>\n\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #6b7280;border-radius:0 8px 8px 0;padding:16px 20px;margin:20px 0;\"><p style=\"margin:0 0 4px;font-size:13px;font-weight:700;color:#6b7280;letter-spacing:1px;\">&#128218; \u7528\u8a9e\u89e3\u8aac<\/p><p style=\"margin:0;font-size:15px;line-height:1.7;\"><strong>CSS\u306e\u8272\u6307\u5b9a\u5f62\u5f0f<\/strong>\uff1abackground-color\u3067\u4f7f\u3048\u308b\u8272\u306e\u5024\u306f\u5927\u304d\u304f4\u7a2e\u985e\u3002\u2460\u30ab\u30e9\u30fc\u540d\uff08red, blue, white\u7b49\u306e\u82f1\u8a9e\u540d\uff09\u3001\u2461HEX\u30b3\u30fc\u30c9\uff08#ff0000\u306e\u3088\u3046\u306a16\u9032\u6570\u5f62\u5f0f\uff09\u3001\u2462RGB\uff08rgb(255,0,0)\u306e\u3088\u3046\u306b\u8d64\u7dd1\u9752\u306e\u5f37\u5ea6\u3092\u6307\u5b9a\uff09\u3001\u2463HSL\uff08hsl(0, 100%, 50%)\u306e\u3088\u3046\u306b\u8272\u76f8\u30fb\u5f69\u5ea6\u30fb\u660e\u5ea6\u3067\u6307\u5b9a\uff09\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u308c\u305e\u308c\u5f97\u610f\u306a\u5834\u9762\u304c\u7570\u306a\u308a\u307e\u3059\u3002<\/p><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">background-color\u3067\u4f7f\u3048\u308b\u8272\u306e\u6307\u5b9a\u65b9\u6cd5\u306f4\u7a2e\u985e\u3042\u308a\u307e\u3059\u3002<br>\u3069\u308c\u3092\u4f7f\u3063\u3066\u3082\u540c\u3058\u300c\u80cc\u666f\u8272\u306e\u8a2d\u5b9a\u300d\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u5834\u9762\u306b\u3088\u3063\u3066\u4f7f\u3044\u5206\u3051\u308b\u3068\u52b9\u7387\u7684\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u307e\u305a\u306f\u30ab\u30e9\u30fc\u540d\uff08\u82f1\u8a9e\u3067\u306e\u8272\u6307\u5b9a\uff09\u304b\u3089\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<br>red\u30fbblue\u30fbgreen\u30fbwhite\u30fbblack\u306a\u3069\u3001\u8272\u306e\u82f1\u8a9e\u540d\u3092\u305d\u306e\u307e\u307e\u66f8\u3051\u308b\u6700\u3082\u30b7\u30f3\u30d7\u30eb\u306a\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* \u30ab\u30e9\u30fc\u540d\u3067\u306e\u80cc\u666f\u8272\u6307\u5b9a *\/\nbody { background-color: white; }\n.header { background-color: navy; }\n.alert { background-color: red; }\n.success { background-color: lightgreen; }\n.warning { background-color: gold; }\n.sidebar { background-color: ghostwhite; }<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u30ab\u30e9\u30fc\u540d\u306f\u30b7\u30f3\u30d7\u30eb\u3067\u3059\u304c\u3001<strong>147\u7a2e\u985e\u4ee5\u4e0a\u306e\u540d\u524d<\/strong>\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u304a\u308a\u3001ghostwhite\u30fbaliceblue\u30fblavenderblush\u306a\u3069\u8a69\u7684\u306a\u540d\u524d\u3082\u3042\u308a\u307e\u3059\u3002<br>\u305f\u3060\u3057\u3001\u30c7\u30b6\u30a4\u30f3\u306e\u7cbe\u5ea6\u3092\u6c42\u3081\u308b\u5834\u5408\u306fHEX\u3084RGB\u3092\u4f7f\u3046\u307b\u3046\u304c\u78ba\u5b9f\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6b21\u306b<strong>HEX\u30b3\u30fc\u30c9\uff0816\u9032\u6570\uff09<\/strong>\u3067\u306e\u6307\u5b9a\u3092\u898b\u3066\u307f\u307e\u3059\u3002<br>Web\u30c7\u30b6\u30a4\u30f3\u3067\u6700\u3082\u5e83\u304f\u4f7f\u308f\u308c\u308b\u5f62\u5f0f\u3067\u3001#\u306e\u5f8c\u306b6\u6841\u306e\u82f1\u6570\u5b57\u3067\u8272\u3092\u8868\u73fe\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* HEX\u30b3\u30fc\u30c9\u3067\u306e\u80cc\u666f\u8272\u6307\u5b9a *\/\nbody { background-color: #ffffff; }        \/* \u767d *\/\n.hero { background-color: #1a1a1a; }       \/* \u307b\u307c\u9ed2\uff08\u30c0\u30fc\u30af\u30bb\u30af\u30b7\u30e7\u30f3\uff09 *\/\n.card { background-color: #f8f9fa; }        \/* \u8584\u3044\u30b0\u30ec\u30fc\uff08\u30ab\u30fc\u30c9\u80cc\u666f\uff09 *\/\n.cta { background-color: #dc2626; }         \/* \u8d64\uff08CTA\u80cc\u666f\uff09 *\/\n.highlight { background-color: #fef9c3; }   \/* \u8584\u3044\u9ec4\u8272\uff08\u30cf\u30a4\u30e9\u30a4\u30c8\uff09 *\/\n.code { background-color: #1e1e1e; }        \/* \u6fc3\u3044\u30b0\u30ec\u30fc\uff08\u30b3\u30fc\u30c9\u30d6\u30ed\u30c3\u30af\uff09 *\/<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">HEX\u30b3\u30fc\u30c9\u306e<strong>\u8aad\u307f\u65b9<\/strong>\uff1a#RRGGBB\u306e\u5f62\u5f0f\u3067\u3001\u6700\u521d\u306e2\u6841\u304c\u8d64\uff08Red\uff09\u3001\u6b21\u306e2\u6841\u304c\u7dd1\uff08Green\uff09\u3001\u6700\u5f8c\u306e2\u6841\u304c\u9752\uff08Blue\uff09\u306e\u5f37\u3055\u309216\u9032\u6570\uff0800\u301cFF\uff09\u3067\u8868\u3057\u307e\u3059\u3002<br>#dc2626\u306e\u5834\u5408\u3001dc=220\uff08\u8d64\u5f37\uff09\u300126=38\uff08\u7dd1\u5f31\uff09\u300126=38\uff08\u9752\u5f31\uff09\u2192 \u8d64\u7cfb\u306e\u8272\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"g-flow-row\" style=\"margin:24px 0;\">\n  <div class=\"g-flow-item\">#<br><small>\u8a18\u53f7<\/small><\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">RR<br><small>\u8d64 00\u301cFF<\/small><\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">GG<br><small>\u7dd1 00\u301cFF<\/small><\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">BB<br><small>\u9752 00\u301cFF<\/small><\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">\u8272\u304c\u6c7a\u307e\u308b<\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u7d9a\u3044\u3066<strong>RGB\u5f62\u5f0f<\/strong>\u3067\u3059\u3002\u8d64\u30fb\u7dd1\u30fb\u9752\u305d\u308c\u305e\u308c\u306e\u5f37\u3055\u30920\u301c255\u306e\u6570\u5024\u3067\u6307\u5b9a\u3057\u307e\u3059\u3002<br>HEX\u30b3\u30fc\u30c9\u3068\u5185\u90e8\u7684\u306b\u306f\u540c\u3058\u8272\u3092\u8868\u3057\u3066\u304a\u308a\u3001\u6570\u5024\u3092\u76f4\u611f\u7684\u306b\u8abf\u6574\u3067\u304d\u308b\u306e\u304c\u7279\u5fb4\u3067\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* RGB\u3067\u306e\u80cc\u666f\u8272\u6307\u5b9a *\/\n.section-a { background-color: rgb(248, 249, 250); }  \/* \u8584\u3044\u30b0\u30ec\u30fc *\/\n.section-b { background-color: rgb(220, 38, 38); }   \/* \u8d64 *\/\n.section-c { background-color: rgb(37, 99, 235); }   \/* \u9752 *\/\n.section-d { background-color: rgb(22, 163, 74); }   \/* \u7dd1 *\/\n.section-e { background-color: rgb(0, 0, 0); }       \/* \u9ed2 *\/\n.section-f { background-color: rgb(255, 255, 255); } \/* \u767d *\/<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u5f8c\u306b<strong>HSL\u5f62\u5f0f<\/strong>\u3067\u3059\u3002\u8272\u76f8\uff08H: 0\u301c360\u5ea6\uff09\u30fb\u5f69\u5ea6\uff08S: 0\u301c100%\uff09\u30fb\u660e\u5ea6\uff08L: 0\u301c100%\uff09\u3067\u8272\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<br>\u30c7\u30b6\u30a4\u30f3\u7684\u306a\u76f4\u611f\u3068\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u30d0\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u5c55\u958b\u304c\u3057\u3084\u3059\u3044\u306e\u304c\u7279\u5fb4\u3067\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* HSL\u3067\u306e\u80cc\u666f\u8272\u6307\u5b9a *\/\n.brand-bg { background-color: hsl(0, 72%, 51%); }      \/* \u30d6\u30e9\u30f3\u30c9\u8d64 *\/\n.brand-light { background-color: hsl(0, 72%, 95%); }  \/* \u8584\u3044\u8d64\uff08\u660e\u5ea6\u30a2\u30c3\u30d7\uff09 *\/\n.brand-dark { background-color: hsl(0, 72%, 30%); }   \/* \u6fc3\u3044\u8d64\uff08\u660e\u5ea6\u30c0\u30a6\u30f3\uff09 *\/\n.neutral { background-color: hsl(220, 9%, 97%); }     \/* \u8584\u3044\u30b0\u30ec\u30fc\u80cc\u666f *\/\n.info { background-color: hsl(217, 91%, 95%); }       \/* \u8584\u3044\u9752\uff08\u30a4\u30f3\u30d5\u30a9\u80cc\u666f\uff09 *\/<\/pre><\/div>\n\n\n\n<table>\n<thead><tr><th>\u5f62\u5f0f<\/th><th>\u66f8\u304d\u65b9\u4f8b<\/th><th>\u7279\u5fb4<\/th><th>\u304a\u3059\u3059\u3081\u5834\u9762<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>\u30ab\u30e9\u30fc\u540d<\/td><td>background-color: white<\/td><td>\u30b7\u30f3\u30d7\u30eb\u30fb\u76f4\u611f\u7684<\/td><td>\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u30fb\u30c6\u30b9\u30c8\u7528<\/td><\/tr>\n<tr><td>HEX<\/td><td>background-color: #f8f9fa<\/td><td>\u30c7\u30b6\u30a4\u30f3\u30c4\u30fc\u30eb\u3068\u9023\u643a\u3057\u3084\u3059\u3044<\/td><td>\u672c\u756a\u30b3\u30fc\u30c9\u30fb\u30c7\u30b6\u30a4\u30f3\u5171\u6709<\/td><\/tr>\n<tr><td>RGB<\/td><td>background-color: rgb(248,249,250)<\/td><td>\u6570\u5024\u8a08\u7b97\u3057\u3084\u3059\u3044<\/td><td>\u52d5\u7684\u306b\u8272\u3092\u5909\u3048\u308b\u5834\u5408<\/td><\/tr>\n<tr><td>HSL<\/td><td>background-color: hsl(220,9%,97%)<\/td><td>\u30d0\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u5c55\u958b\u3057\u3084\u3059\u3044<\/td><td>\u30ab\u30e9\u30fc\u30d1\u30ec\u30c3\u30c8\u8a2d\u8a08\u6642<\/td><\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<div style=\"background:#f0fdf4;border:1px solid #22c55e;border-radius:8px;padding:20px 24px;margin:24px 0;\"><div style=\"display:flex;align-items:center;gap:8px;margin-bottom:12px;\"><span style=\"font-size:18px;\">&#128161;<\/span><strong style=\"color:#16a34a;font-size:15px;\">Figma\u304b\u3089HEX\u30b3\u30fc\u30c9\u3092\u30b3\u30d4\u30fc\u3059\u308b<\/strong><\/div><p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">Figma\u306a\u3069\u306e\u30c7\u30b6\u30a4\u30f3\u30c4\u30fc\u30eb\u3067\u306f\u3001\u8981\u7d20\u3092\u9078\u629e\u3059\u308b\u3068\u53f3\u30d1\u30cd\u30eb\u306bHEX\u30b3\u30fc\u30c9\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u305d\u306e\u307e\u307e\u30b3\u30d4\u30fc\u3057\u3066CSS\u306b\u8cbc\u308a\u4ed8\u3051\u308b\u3060\u3051\u3067OK\u3067\u3059\u3002\u300c\u30c7\u30b6\u30a4\u30f3\u3068\u30b3\u30fc\u30c9\u306e\u8272\u304c\u9055\u3046\u300d\u3068\u3044\u3046\u30c8\u30e9\u30d6\u30eb\u3092\u9632\u3050\u305f\u3081\u306b\u3082\u3001\u30c7\u30b6\u30a4\u30f3\u30c4\u30fc\u30eb\u306eHEX\u5024\u3092\u305d\u306e\u307e\u307e\u4f7f\u3044\u307e\u3057\u3087\u3046\u3002<\/p><\/div>\n\n\n\n<div class=\"balloon-wrap is-right\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/yamazaki-avatar.png\" alt=\"AI\u9b3c\u7ba1\u7406\u5c71\u5d0e\">\n    <span class=\"balloon-name\">AI\u9b3c\u7ba1\u7406\u5c71\u5d0e<\/span>\n  <\/div>\n  <div class=\"balloon-body\">4\u7a2e\u985e\u3042\u308b\u8272\u306e\u6307\u5b9a\u65b9\u6cd5\u3067\u3059\u304c\u3001\u6700\u521d\u306fHEX\u30b3\u30fc\u30c9\u3060\u3051\u899a\u3048\u3066\u304a\u3051\u3070\u5b9f\u52d9\u3067\u56f0\u308a\u307e\u305b\u3093\u3002\u30c7\u30b6\u30a4\u30f3\u30c4\u30fc\u30eb\u304b\u3089\u305d\u306e\u307e\u307e\u30b3\u30d4\u30fc\u3067\u304d\u308b\u306e\u3067\u3001\u4e00\u756a\u5b9f\u7528\u7684\u3067\u3059\u3002<\/div>\n<\/div>\n\n\n\n<div class=\"balloon-wrap\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/ceo-sugasawa.jpg\" alt=\"\u4ee3\u8868\u83c5\u6fa4\">\n    <span class=\"balloon-name\">\u4ee3\u8868\u83c5\u6fa4<\/span>\n  <\/div>\n  <div class=\"balloon-body\">\u30c1\u30fc\u30e0\u3067CSS\u5909\u6570\uff08--bg-primary: #dc2626; \u306e\u3088\u3046\u306a\u5909\u6570\uff09\u3092\u4f7f\u3046\u3068\u3001\u3069\u306e\u5f62\u5f0f\u3067\u66f8\u3044\u3066\u3044\u3066\u3082\u4e00\u5143\u7ba1\u7406\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306f\u5f8c\u307b\u3069\u8a73\u3057\u304f\u8aac\u660e\u3057\u307e\u3059\u306d\u3002<\/div>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-css-background&#038;blog_slug=cc-css-background\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-css-background&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-03\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">03<\/span>\n  <span class=\"section-label\" style=\"display:block;\">RGBA TRANSPARENT<\/span>\n  <span class=\"section-title\" style=\"display:block;\">rgba()\u3067\u534a\u900f\u660e\u80cc\u666f\u3092\u4f5c\u308b<\/span>\n  <span class=\"section-desc\">\u900f\u660e\u5ea6\u3092\u4f7f\u3063\u305f\u30aa\u30fc\u30d0\u30fc\u30ec\u30a4\u30fb\u30d5\u30ed\u30b9\u30c8\u52b9\u679c<\/span>\n<\/h2>\n\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #6b7280;border-radius:0 8px 8px 0;padding:16px 20px;margin:20px 0;\"><p style=\"margin:0 0 4px;font-size:13px;font-weight:700;color:#6b7280;letter-spacing:1px;\">&#128218; \u7528\u8a9e\u89e3\u8aac<\/p><p style=\"margin:0;font-size:15px;line-height:1.7;\"><strong>rgba()\uff08Red Green Blue Alpha\uff09<\/strong>\uff1aRGB\u306b\u900f\u660e\u5ea6\uff08Alpha\uff09\u3092\u52a0\u3048\u305f\u8272\u6307\u5b9a\u95a2\u6570\u3002rgba(\u8d64, \u7dd1, \u9752, \u900f\u660e\u5ea6)\u306e4\u5f15\u6570\u3067\u6307\u5b9a\u3057\u3001\u900f\u660e\u5ea6\uff08\u30a2\u30eb\u30d5\u30a1\u5024\uff09\u306f0\uff08\u5b8c\u5168\u900f\u660e\uff09\u301c1\uff08\u5b8c\u5168\u4e0d\u900f\u660e\uff09\u306e\u5c0f\u6570\u3067\u8a2d\u5b9a\u3057\u307e\u3059\u3002\u80cc\u666f\u8272\u306b\u900f\u660e\u5ea6\u3092\u6301\u305f\u305b\u308b\u3053\u3068\u3067\u3001\u5f8c\u308d\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u900f\u904e\u3055\u305b\u306a\u304c\u3089\u8272\u3092\u91cd\u306d\u308b\u30aa\u30fc\u30d0\u30fc\u30ec\u30a4\u52b9\u679c\u304c\u4f5c\u308c\u307e\u3059\u3002<\/p><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">background-color\u306e\u5024\u306brgba()\u3092\u4f7f\u3046\u3068\u3001<strong>\u534a\u900f\u660e\u306e\u80cc\u666f\u8272<\/strong>\u3092\u4f5c\u308c\u307e\u3059\u3002<br>4\u756a\u76ee\u306e\u5f15\u6570\uff08\u30a2\u30eb\u30d5\u30a1\u5024\uff09\u304c\u900f\u660e\u5ea6\u3067\u30010\u304c\u5b8c\u5168\u900f\u660e\u30fb1\u304c\u5b8c\u5168\u4e0d\u900f\u660e\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u534a\u900f\u660e\u80cc\u666f\u306e\u4ee3\u8868\u7684\u306a\u4f7f\u3044\u65b9\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* rgba()\u3067\u534a\u900f\u660e\u80cc\u666f *\/\n\n\/* \u30d2\u30fc\u30ed\u30fc\u753b\u50cf\u306e\u4e0a\u306e\u30c6\u30ad\u30b9\u30c8\u30dc\u30c3\u30af\u30b9 *\/\n.hero-text-box {\n  background-color: rgba(0, 0, 0, 0.6);  \/* \u9ed260%\u900f\u904e *\/\n  padding: 32px;\n  border-radius: 8px;\n}\n\n\/* \u6ce8\u610f\u559a\u8d77\u30dc\u30c3\u30af\u30b9\uff08\u8d64\u306e\u8584\u3044\u80cc\u666f\uff09 *\/\n.alert-box {\n  background-color: rgba(220, 38, 38, 0.1);  \/* \u8d6410%\u900f\u904e *\/\n  border: 1px solid rgba(220, 38, 38, 0.3);\n  border-radius: 8px;\n  padding: 16px;\n}\n\n\/* \u6210\u529f\u30e1\u30c3\u30bb\u30fc\u30b8\uff08\u7dd1\u306e\u8584\u3044\u80cc\u666f\uff09 *\/\n.success-box {\n  background-color: rgba(22, 163, 74, 0.1);  \/* \u7dd110%\u900f\u904e *\/\n  border: 1px solid rgba(22, 163, 74, 0.3);\n}\n\n\/* \u30e2\u30fc\u30c0\u30eb\u30aa\u30fc\u30d0\u30fc\u30ec\u30a4\uff08\u30da\u30fc\u30b8\u5168\u4f53\u3092\u8584\u6697\u304f\u3059\u308b\uff09 *\/\n.modal-overlay {\n  background-color: rgba(0, 0, 0, 0.5);  \/* \u9ed250%\u900f\u904e *\/\n  position: fixed;\n  inset: 0;\n  z-index: 100;\n}<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u30a2\u30eb\u30d5\u30a1\u5024\u306e\u4f7f\u3044\u5206\u3051\u3092\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<table>\n<thead><tr><th>\u30a2\u30eb\u30d5\u30a1\u5024<\/th><th>\u900f\u660e\u5ea6<\/th><th>\u898b\u3048\u65b9<\/th><th>\u4e3b\u306a\u7528\u9014<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>0<\/td><td>\u5b8c\u5168\u900f\u660e<\/td><td>\u80cc\u666f\u304c\u5b8c\u5168\u306b\u900f\u3051\u3066\u898b\u3048\u308b<\/td><td>\u8272\u3092\u975e\u8868\u793a\u306b\u3057\u305f\u3044\u3068\u304d<\/td><\/tr>\n<tr><td>0.05\u301c0.1<\/td><td>\u307b\u307c\u900f\u660e<\/td><td>\u3046\u3063\u3059\u3089\u8272\u304c\u3064\u304f\u7a0b\u5ea6<\/td><td>\u30a4\u30f3\u30d5\u30a9\u30fb\u6210\u529f\u30fb\u8b66\u544a\u30dc\u30c3\u30af\u30b9\u306e\u80cc\u666f<\/td><\/tr>\n<tr><td>0.3\u301c0.4<\/td><td>\u8584\u3081<\/td><td>\u3046\u3063\u3059\u3089\u900f\u3051\u306a\u304c\u3089\u8272\u304c\u308f\u304b\u308b<\/td><td>\u30bf\u30b0\u30fb\u30d0\u30c3\u30b8\u30fb\u30e9\u30d9\u30eb\u306e\u80cc\u666f<\/td><\/tr>\n<tr><td>0.5<\/td><td>\u534a\u900f\u660e<\/td><td>\u80cc\u666f\u3068\u8272\u304c\u5747\u7b49\u306b\u6df7\u3056\u308b<\/td><td>\u30aa\u30fc\u30d0\u30fc\u30ec\u30a4\u30fb\u30d5\u30ed\u30b9\u30c8\u52b9\u679c<\/td><\/tr>\n<tr><td>0.6\u301c0.7<\/td><td>\u3084\u3084\u4e0d\u900f\u660e<\/td><td>\u8272\u304c\u4e3b\u4f53\u3067\u3046\u3063\u3059\u3089\u900f\u3051\u308b<\/td><td>\u30d2\u30fc\u30ed\u30fc\u4e0a\u306e\u30c6\u30ad\u30b9\u30c8\u80cc\u666f<\/td><\/tr>\n<tr><td>0.85\u301c0.95<\/td><td>\u307b\u307c\u4e0d\u900f\u660e<\/td><td>\u308f\u305a\u304b\u306b\u900f\u3051\u308b\u7a0b\u5ea6<\/td><td>\u30e2\u30c0\u30f3\u306a\u30d5\u30ed\u30b9\u30c8\/\u30ac\u30e9\u30b9\u52b9\u679c<\/td><\/tr>\n<tr><td>1<\/td><td>\u5b8c\u5168\u4e0d\u900f\u660e<\/td><td>\u5b8c\u5168\u306b\u5857\u308a\u3064\u3076\u3055\u308c\u308b<\/td><td>\u901a\u5e38\u306e\u80cc\u666f\u8272\u6307\u5b9a<\/td><\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">rgba()\u3092\u4f7f\u3063\u305f\u30e2\u30c0\u30f3\u306a\u30c7\u30b6\u30a4\u30f3\u30c6\u30af\u30cb\u30c3\u30af\u300c<strong>\u30b0\u30e9\u30b9\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0<\/strong>\u300d\u3082\u4eba\u6c17\u3067\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* \u30b0\u30e9\u30b9\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\uff08\u30d5\u30ed\u30b9\u30c8\u30ac\u30e9\u30b9\u98a8\uff09 *\/\n.glass-card {\n  background-color: rgba(255, 255, 255, 0.15);  \/* \u767d15%\u900f\u904e *\/\n  backdrop-filter: blur(10px);                   \/* \u80cc\u666f\u3092\u307c\u304b\u3059 *\/\n  -webkit-backdrop-filter: blur(10px);\n  border: 1px solid rgba(255, 255, 255, 0.25);\n  border-radius: 16px;\n  padding: 32px;\n  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);\n}<\/pre><\/div>\n\n\n\n<div style=\"background:#fef2f2;border:2px solid #dc2626;border-radius:8px;padding:20px 24px;margin:24px 0;\"><div style=\"display:flex;align-items:center;gap:8px;margin-bottom:12px;\"><span style=\"font-size:20px;\">&#9888;&#65039;<\/span><strong style=\"color:#dc2626;font-size:16px;\">backdrop-filter\u306e\u30d6\u30e9\u30a6\u30b6\u5bfe\u5fdc\u306b\u6ce8\u610f<\/strong><\/div><p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">backdrop-filter\uff08\u80cc\u666f\u307c\u304b\u3057\uff09\u306f\u4e3b\u8981\u30d6\u30e9\u30a6\u30b6\uff08Chrome\u30fbFirefox\u30fbSafari\uff09\u3067\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u53e4\u3044\u30d6\u30e9\u30a6\u30b6\u3067\u306f\u52d5\u4f5c\u3057\u307e\u305b\u3093\u3002\u30b0\u30e9\u30b9\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0\u3092\u4f7f\u3046\u5834\u5408\u306f\u3001backdrop-filter\u304c\u52b9\u304b\u306a\u3044\u30d6\u30e9\u30a6\u30b6\u3067\u3082\u8aad\u3081\u308b\u3088\u3046\u3001rgba()\u306e\u4e0d\u900f\u660e\u5ea6\u3092\u9ad8\u3081\u306b\u3057\u3066\u304a\u304f\u306e\u304c\u5b89\u5168\u3067\u3059\u3002<\/p><\/div>\n\n\n\n<div style=\"background:#f0fdf4;border:1px solid #22c55e;border-radius:8px;padding:20px 24px;margin:24px 0;\"><div style=\"display:flex;align-items:center;gap:8px;margin-bottom:12px;\"><span style=\"font-size:18px;\">&#128161;<\/span><strong style=\"color:#16a34a;font-size:15px;\">\u73fe\u4ee3CSS\u3067\u306fhsla()\u3082\u4f7f\u3048\u308b<\/strong><\/div><p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">rgba()\u3068\u540c\u69d8\u306bhsla()\u3067\u3082\u900f\u660e\u5ea6\u3092\u6307\u5b9a\u3067\u304d\u307e\u3059\u3002hsla(0, 72%, 51%, 0.1)\u306e\u3088\u3046\u306b\u66f8\u304d\u307e\u3059\u3002HSL\u5f62\u5f0f\u3067\u914d\u8272\u3092\u8a2d\u8a08\u3057\u3066\u3044\u308b\u5834\u5408\u306fhsla()\u3092\u4f7f\u3046\u3068\u7d71\u4e00\u611f\u304c\u51fa\u307e\u3059\u3002\u307e\u305f\u3001\u73fe\u4ee3\u306eCSS\u3067\u306f\u300crgb(220 38 38 \/ 10%)\u300d\u306e\u3088\u3046\u306a\u30b9\u30da\u30fc\u30b9\u533a\u5207\u308a\u65b0\u66f8\u5f0f\u3082\u4f7f\u3048\u307e\u3059\u3002<\/p><\/div>\n\n\n\n<div class=\"g-flow-row\" style=\"margin:24px 0;\">\n  <div class=\"g-flow-item\">\u8272\u3092\u6c7a\u3081\u308b<br><small>rgb(R,G,B)<\/small><\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">\u30a2\u30eb\u30d5\u30a1\u5024\u3092\u6c7a\u3081\u308b<br><small>0\u301c1\u306e\u5c0f\u6570<\/small><\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">rgba()\u3067\u6307\u5b9a<br><small>4\u5f15\u6570<\/small><\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">\u534a\u900f\u660e\u80cc\u666f\u306e\u5b8c\u6210<\/div>\n<\/div>\n\n\n\n<div class=\"balloon-wrap\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/ceo-sugasawa.jpg\" alt=\"\u4ee3\u8868\u83c5\u6fa4\">\n    <span class=\"balloon-name\">\u4ee3\u8868\u83c5\u6fa4<\/span>\n  <\/div>\n  <div class=\"balloon-body\">rgba(220, 38, 38, 0.1)\u306e\u3088\u3046\u306a\u8584\u3044\u8d64\u80cc\u666f\u306f\u3001\u8b66\u544a\u30dc\u30c3\u30af\u30b9\u3084\u30a8\u30e9\u30fc\u8868\u793a\u306b\u6700\u9069\u3067\u3059\u3002\u771f\u3063\u8d64\u306b\u3059\u308b\u3088\u308a\u300c\u6ce8\u76ee\u3057\u3066\u307b\u3057\u3044\u3051\u3069\u5727\u8feb\u611f\u306f\u5c11\u306a\u304f\u300d\u3068\u3044\u3046\u30d0\u30e9\u30f3\u30b9\u3092\u53d6\u308c\u307e\u3059\u3002<\/div>\n<\/div>\n\n\n\n<div class=\"balloon-wrap is-right\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/yamazaki-avatar.png\" alt=\"AI\u9b3c\u7ba1\u7406\u5c71\u5d0e\">\n    <span class=\"balloon-name\">AI\u9b3c\u7ba1\u7406\u5c71\u5d0e<\/span>\n  <\/div>\n  <div class=\"balloon-body\">\u30e2\u30fc\u30c0\u30eb\u306e\u80cc\u666f\u30aa\u30fc\u30d0\u30fc\u30ec\u30a4\u306freba(0,0,0,0.5)\u304c\u5b9a\u756a\u3067\u3059\u3002\u534a\u900f\u660e\u306e\u9ed2\u3067\u30da\u30fc\u30b8\u5168\u4f53\u3092\u8584\u6697\u304f\u3057\u3066\u3001\u30e2\u30fc\u30c0\u30eb\u30a6\u30a3\u30f3\u30c9\u30a6\u306b\u8996\u7dda\u3092\u96c6\u3081\u308b\u2014\u2014\u3088\u304f\u898b\u308bUI\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u306d\u3002<\/div>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-css-background&#038;blog_slug=cc-css-background\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-css-background&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-04\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">04<\/span>\n  <span class=\"section-label\" style=\"display:block;\">GRADIENT DIFF<\/span>\n  <span class=\"section-title\" style=\"display:block;\">\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\uff08background: linear-gradient\uff09\u3068\u306e\u9055\u3044<\/span>\n  <span class=\"section-desc\">\u5358\u8272\u80cc\u666f\u3068\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u80cc\u666f\u306e\u4f7f\u3044\u5206\u3051<\/span>\n<\/h2>\n\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #6b7280;border-radius:0 8px 8px 0;padding:16px 20px;margin:20px 0;\"><p style=\"margin:0 0 4px;font-size:13px;font-weight:700;color:#6b7280;letter-spacing:1px;\">&#128218; \u7528\u8a9e\u89e3\u8aac<\/p><p style=\"margin:0;font-size:15px;line-height:1.7;\"><strong>linear-gradient\uff08\u7dda\u5f62\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\uff09<\/strong>\uff1aCSS\u306e\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u95a2\u6570\u3002background\uff08\u307e\u305f\u306fbackground-image\uff09\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u6307\u5b9a\u3057\u30012\u8272\u4ee5\u4e0a\u306e\u8272\u304c\u6ed1\u3089\u304b\u306b\u5909\u5316\u3059\u308b\u80cc\u666f\u3092\u4f5c\u308a\u307e\u3059\u3002background-color\u306f\u3042\u304f\u307e\u3067\u300c\u5358\u8272\u306e\u80cc\u666f\u8272\u300d\u306a\u306e\u306b\u5bfe\u3057\u3001\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u306fbackground-image\u3068\u3057\u3066\u6271\u308f\u308c\u307e\u3059\u3002\u305d\u306e\u305f\u3081background-color\u3068linear-gradient\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u3092\u4f5c\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">background-color\u306f<strong>\u5358\u8272\u306e\u80cc\u666f\u8272<\/strong>\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u304c\u3001<br>\u300c2\u8272\u3092\u6ed1\u3089\u304b\u306b\u3064\u306a\u304e\u305f\u3044\u300d\u300c\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u306b\u3057\u305f\u3044\u300d\u3068\u3044\u3046\u5834\u5408\u306f<strong>linear-gradient\uff08\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u95a2\u6570\uff09<\/strong>\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">background-color\u3068linear-gradient\u306f\u6df7\u540c\u3057\u3084\u3059\u3044\u306e\u3067\u3001\u9055\u3044\u3092\u3057\u3063\u304b\u308a\u7406\u89e3\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<table>\n<thead><tr><th>\u6bd4\u8f03\u9805\u76ee<\/th><th>background-color<\/th><th>linear-gradient<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>\u30d7\u30ed\u30d1\u30c6\u30a3<\/td><td>background-color<\/td><td>background \u307e\u305f\u306f background-image<\/td><\/tr>\n<tr><td>\u8272\u6570<\/td><td>1\u8272\u306e\u307f<\/td><td>2\u8272\u4ee5\u4e0a\uff08\u7121\u5236\u9650\uff09<\/td><\/tr>\n<tr><td>\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3<\/td><td>\u4e0d\u53ef\uff08\u5358\u8272\u306e\u307f\uff09<\/td><td>\u53ef\u80fd\uff08\u65b9\u5411\u30fb\u89d2\u5ea6\u3082\u6307\u5b9a\u53ef\uff09<\/td><\/tr>\n<tr><td>\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af<\/td><td>\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u975e\u5bfe\u5fdc\u6642\u306e\u4ee3\u66ff\u3068\u3057\u3066\u4f7f\u7528\u53ef<\/td><td>background-color\u304c\u4e0b\u306b\u3042\u308b\u5834\u5408\u306b\u900f\u3051\u3066\u898b\u3048\u308b<\/td><\/tr>\n<tr><td>\u5178\u578b\u7684\u306a\u7528\u9014<\/td><td>\u30d8\u30c3\u30c0\u30fc\u80cc\u666f\u30fb\u30ab\u30fc\u30c9\u80cc\u666f\u30fb\u30dc\u30bf\u30f3\u80cc\u666f<\/td><td>\u30d2\u30fc\u30ed\u30fc\u30bb\u30af\u30b7\u30e7\u30f3\u30fbCTA\u30d0\u30ca\u30fc\u30fb\u30a2\u30a4\u30b3\u30f3\u80cc\u666f<\/td><\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* background-color\u306f\u5358\u8272 *\/\n.single-color {\n  background-color: #dc2626;  \/* \u8d64\u4e00\u8272 *\/\n}\n\n\/* linear-gradient\u306f\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3 *\/\n.gradient-bg {\n  background: linear-gradient(135deg, #dc2626 0%, #991b1b 100%);\n  \/* \u5de6\u4e0a\u306e\u660e\u308b\u3044\u8d64\u304b\u3089\u53f3\u4e0b\u306e\u6fc3\u3044\u8d64\u3078 *\/\n}\n\n\/* \u4e0a\u304b\u3089\u4e0b\u3078 *\/\n.top-to-bottom {\n  background: linear-gradient(to bottom, #ffffff 0%, #f8f9fa 100%);\n}\n\n\/* \u5de6\u304b\u3089\u53f3\u3078\uff083\u8272\uff09 *\/\n.three-color {\n  background: linear-gradient(to right, #dc2626, #f97316, #facc15);\n}<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">linear-gradient\u306f<strong>background\u30d7\u30ed\u30d1\u30c6\u30a3<\/strong>\uff08background-color\u3067\u306f\u306a\u304f\uff09\u306b\u6307\u5b9a\u3059\u308b\u306e\u304c\u6b63\u3057\u3044\u66f8\u304d\u65b9\u3067\u3059\u3002<br>background-image\u306b\u3082\u6307\u5b9a\u3067\u304d\u307e\u3059\u304c\u3001background\u304c\u6700\u3082\u30b7\u30f3\u30d7\u30eb\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u307e\u305f\u3001<strong>background-color\u3092\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af<\/strong>\u3068\u3057\u3066\u4f7f\u3046\u30c6\u30af\u30cb\u30c3\u30af\u304c\u3042\u308a\u307e\u3059\u3002<br>\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u304c\u8868\u793a\u3055\u308c\u306a\u3044\u53e4\u3044\u30d6\u30e9\u30a6\u30b6\u3067\u3082\u3001\u5358\u8272\u306e\u80cc\u666f\u304c\u898b\u3048\u308b\u3088\u3046\u306b\u3059\u308b\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* \u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u975e\u5bfe\u5fdc\u30d6\u30e9\u30a6\u30b6\u5411\u3051\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af *\/\n.hero-section {\n  background-color: #dc2626;  \/* \u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\uff08\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u975e\u5bfe\u5fdc\u6642\uff09 *\/\n  background: linear-gradient(135deg, #dc2626 0%, #991b1b 100%);\n  \/* \u5bfe\u5fdc\u30d6\u30e9\u30a6\u30b6\u3067\u306f\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u304c\u9069\u7528\u3055\u308c\u308b *\/\n}<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">radialtual-gradient\uff08\u653e\u5c04\u72b6\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\uff09\u3084conic-gradient\uff08\u5186\u9310\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\uff09\u3082background\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u4f7f\u3048\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* \u653e\u5c04\u72b6\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3 *\/\n.radial-bg {\n  background: radial-gradient(circle at center, #ffffff 0%, #f8f9fa 100%);\n}\n\n\/* \u5186\u9310\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\uff08\u30c9\u30fc\u30ca\u30c4\u72b6\uff09 *\/\n.conic-bg {\n  background: conic-gradient(from 0deg, #dc2626, #f97316, #facc15, #dc2626);\n}\n\n\/* \u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3 + background-color \u306e\u91cd\u306d *\/\n.overlay-gradient {\n  background-color: #1a1a1a;\n  background-image: linear-gradient(rgba(220,38,38,0.3) 0%, transparent 100%);\n}<\/pre><\/div>\n\n\n\n<div style=\"background:#f0fdf4;border:1px solid #22c55e;border-radius:8px;padding:20px 24px;margin:24px 0;\"><div style=\"display:flex;align-items:center;gap:8px;margin-bottom:12px;\"><span style=\"font-size:18px;\">&#128161;<\/span><strong style=\"color:#16a34a;font-size:15px;\">CSS\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u30fc\u3092\u6d3b\u7528\u3057\u3088\u3046<\/strong><\/div><p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u306e\u30b3\u30fc\u30c9\u3092\u624b\u66f8\u304d\u3059\u308b\u306e\u306f\u5927\u5909\u3067\u3059\u3002cssgradient.io \u3084 CSS Gradient Generator\uff08https:\/\/cssgradient.io\/\uff09\u306a\u3069\u306e\u30aa\u30f3\u30e9\u30a4\u30f3\u30c4\u30fc\u30eb\u3092\u4f7f\u3048\u3070\u3001\u30d3\u30b8\u30e5\u30a2\u30eb\u3067\u8272\u3092\u9078\u3093\u3067\u30b3\u30fc\u30c9\u3092\u81ea\u52d5\u751f\u6210\u3067\u304d\u307e\u3059\u3002\u751f\u6210\u3055\u308c\u305f\u30b3\u30fc\u30c9\u3092\u305d\u306e\u307e\u307e\u30b3\u30d4\u30fc\u3059\u308b\u3060\u3051\u3067OK\u3067\u3059\u3002<\/p><\/div>\n\n\n\n<div style=\"background:#fafafa;border-radius:8px;padding:16px 20px;margin:16px 0;border-left:4px solid #dc2626;\">\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>\u5358\u8272\u80cc\u666f \u2192 background-color \u3092\u4f7f\u3046<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>2\u8272\u4ee5\u4e0a\u306e\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3 \u2192 background \u307e\u305f\u306f background-image \u306b linear-gradient \u3092\u4f7f\u3046<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>\u53e4\u3044\u30d6\u30e9\u30a6\u30b6\u5411\u3051\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af \u2192 background-color \u3092\u4e0a\u306b\u66f8\u3044\u3066\u304a\u304f<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u306e\u30b3\u30fc\u30c9\u306f\u30aa\u30f3\u30e9\u30a4\u30f3\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u30fc\u3067\u81ea\u52d5\u751f\u6210\u3059\u308b\u306e\u304c\u52b9\u7387\u7684<\/span><\/div>\n<\/div>\n\n\n\n<div class=\"balloon-wrap\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/ceo-sugasawa.jpg\" alt=\"\u4ee3\u8868\u83c5\u6fa4\">\n    <span class=\"balloon-name\">\u4ee3\u8868\u83c5\u6fa4<\/span>\n  <\/div>\n  <div class=\"balloon-body\">CTA\u30dc\u30bf\u30f3\u3084\u30d2\u30fc\u30ed\u30fc\u30bb\u30af\u30b7\u30e7\u30f3\u306b\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u3046\u3068\u4e00\u6c17\u306b\u30c7\u30b6\u30a4\u30f3\u304c\u6d17\u7df4\u3055\u308c\u307e\u3059\u3002background-color\u3067\u5358\u8272\u2192\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u3078\u306e\u79fb\u884c\u306f\u3001\u30b3\u30fc\u30c9\u30921\u884c\u5909\u3048\u308b\u3060\u3051\u306a\u306e\u3067\u6c17\u8efd\u306b\u8a66\u305b\u307e\u3059\u3088\u3002<\/div>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-css-background&#038;blog_slug=cc-css-background\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-css-background&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-05\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">05<\/span>\n  <span class=\"section-label\" style=\"display:block;\">BOX STYLING<\/span>\n  <span class=\"section-title\" style=\"display:block;\">\u30dc\u30c3\u30af\u30b9\u5168\u4f53\u3078\u306e\u80cc\u666f\u8272\u8a2d\u5b9a<\/span>\n  <span class=\"section-desc\">\u30ab\u30fc\u30c9\u30fb\u30d8\u30c3\u30c0\u30fc\u30fb\u30d5\u30c3\u30bf\u30fc\u30fb\u30b5\u30a4\u30c9\u30d0\u30fc\u3078\u306e\u5fdc\u7528<\/span>\n<\/h2>\n\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #6b7280;border-radius:0 8px 8px 0;padding:16px 20px;margin:20px 0;\"><p style=\"margin:0 0 4px;font-size:13px;font-weight:700;color:#6b7280;letter-spacing:1px;\">&#128218; \u7528\u8a9e\u89e3\u8aac<\/p><p style=\"margin:0;font-size:15px;line-height:1.7;\"><strong>CSS\u30dc\u30c3\u30af\u30b9\u30e2\u30c7\u30eb<\/strong>\uff1aHTML\u306e\u5404\u8981\u7d20\u306f\u300c\u30dc\u30c3\u30af\u30b9\u300d\u3068\u3057\u3066\u6271\u308f\u308c\u3001\u30b3\u30f3\u30c6\u30f3\u30c4\u9818\u57df\u30fb\u30d1\u30c7\u30a3\u30f3\u30b0\u30fb\u30dc\u30fc\u30c0\u30fc\u30fb\u30de\u30fc\u30b8\u30f3\u306e4\u5c64\u3067\u69cb\u6210\u3055\u308c\u307e\u3059\u3002background-color\u306f\u30b3\u30f3\u30c6\u30f3\u30c4\u9818\u57df\u3068\u30d1\u30c7\u30a3\u30f3\u30b0\u9818\u57df\u3092\u5857\u308a\u3064\u3076\u3057\u307e\u3059\uff08\u30de\u30fc\u30b8\u30f3\u3068\u30dc\u30fc\u30c0\u30fc\u306f\u542b\u307e\u306a\u3044\uff09\u3002padding\u3092\u5e83\u3052\u308b\u3068\u5857\u308a\u3064\u3076\u3055\u308c\u308b\u7bc4\u56f2\u3082\u5e83\u304c\u308a\u307e\u3059\u3002<\/p><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">background-color\u306fWeb\u30b5\u30a4\u30c8\u306e\u3042\u3089\u3086\u308b\u300c\u30dc\u30c3\u30af\u30b9\uff08\u7bb1\u578b\u8981\u7d20\uff09\u300d\u306b\u4f7f\u3048\u307e\u3059\u3002<br>\u30d8\u30c3\u30c0\u30fc\u30fb\u30d5\u30c3\u30bf\u30fc\u30fb\u30ab\u30fc\u30c9\u30fb\u30b5\u30a4\u30c9\u30d0\u30fc\u30fb\u30e2\u30fc\u30c0\u30eb\u2014\u2014\u3053\u308c\u3089\u3059\u3079\u3066\u306e\u80cc\u666f\u8272\u3092\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b9f\u969b\u306eWeb\u30b5\u30a4\u30c8\u3067\u4f7f\u308f\u308c\u308b\u4ee3\u8868\u7684\u306a\u30d1\u30bf\u30fc\u30f3\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* \u30b5\u30a4\u30c8\u5168\u4f53\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u80cc\u666f *\/\nbody {\n  background-color: #ffffff;  \/* \u767d\u80cc\u666f *\/\n}\n\n\/* \u30d8\u30c3\u30c0\u30fc *\/\nheader {\n  background-color: #1a1a1a;  \/* \u30c0\u30fc\u30af\u30d8\u30c3\u30c0\u30fc *\/\n  color: #ffffff;\n  padding: 16px 32px;\n}\n\n\/* \u30ca\u30d3\u30b2\u30fc\u30b7\u30e7\u30f3 *\/\nnav {\n  background-color: #f8f9fa;  \/* \u8584\u3044\u30b0\u30ec\u30fc *\/\n  border-bottom: 1px solid #e5e7eb;\n}\n\n\/* \u30e1\u30a4\u30f3\u30b3\u30f3\u30c6\u30f3\u30c4\u30a8\u30ea\u30a2 *\/\nmain {\n  background-color: #ffffff;\n}\n\n\/* \u30b5\u30a4\u30c9\u30d0\u30fc *\/\naside {\n  background-color: #f9fafb;  \/* \u767d\u3088\u308a\u308f\u305a\u304b\u306b\u8584\u3044 *\/\n}\n\n\/* \u30d5\u30c3\u30bf\u30fc *\/\nfooter {\n  background-color: #111827;  \/* \u975e\u5e38\u306b\u6fc3\u3044\u30cd\u30a4\u30d3\u30fc *\/\n  color: #e5e7eb;\n  padding: 48px 32px;\n}<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u30ab\u30fc\u30c9\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff08\u60c5\u5831\u3092\u56f2\u3080\u30dc\u30c3\u30af\u30b9\uff09\u306e\u5b9f\u88c5\u4f8b\u3082\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<br>background-color\u306bborder-radius\u30fbbox-shadow\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3068\u3001\u6d6e\u304d\u4e0a\u304c\u3063\u305f\u30ab\u30fc\u30c9\u30c7\u30b6\u30a4\u30f3\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* \u30ab\u30fc\u30c9\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8 *\/\n.card {\n  background-color: #ffffff;\n  border-radius: 12px;\n  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);\n  padding: 24px;\n  margin: 16px 0;\n}\n\n\/* \u30ab\u30fc\u30c9\u30d0\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3 *\/\n.card-primary {\n  background-color: #dc2626;  \/* \u8d64\u80cc\u666f *\/\n  color: #ffffff;\n}\n\n.card-info {\n  background-color: rgba(37, 99, 235, 0.05);  \/* \u8584\u3044\u9752 *\/\n  border: 1px solid rgba(37, 99, 235, 0.2);\n}\n\n.card-success {\n  background-color: rgba(22, 163, 74, 0.05);  \/* \u8584\u3044\u7dd1 *\/\n  border: 1px solid rgba(22, 163, 74, 0.2);\n}\n\n.card-warning {\n  background-color: rgba(217, 119, 6, 0.05);  \/* \u8584\u3044\u30aa\u30ec\u30f3\u30b8 *\/\n  border: 1px solid rgba(217, 119, 6, 0.2);\n}<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u80cc\u666f\u8272\u306fpadding\uff08\u5185\u5074\u306e\u4f59\u767d\uff09\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u300c\u5857\u3089\u308c\u3066\u3044\u308b\u7bc4\u56f2\u300d\u304c\u5e83\u304c\u308a\u307e\u3059\u3002<br>padding\u30920\u306b\u3059\u308b\u3068\u80cc\u666f\u306f\u30c6\u30ad\u30b9\u30c8\u306e\u5f8c\u308d\u3060\u3051\u306b\u53ce\u307e\u308a\u307e\u3059\u304c\u3001padding\u3092\u5e83\u3052\u308b\u3068\u30dc\u30c3\u30af\u30b9\u5168\u4f53\u304c\u8272\u3065\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* padding\u3067\u80cc\u666f\u306e\u5e83\u304c\u308a\u3092\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb *\/\n.narrow-bg {\n  background-color: #fef9c3;\n  padding: 0;  \/* \u30c6\u30ad\u30b9\u30c8\u5e45\u5206\u3060\u3051\u80cc\u666f\u304c\u898b\u3048\u308b *\/\n}\n\n.wide-bg {\n  background-color: #fef9c3;\n  padding: 16px 24px;  \/* \u4e0a\u4e0b16px \u5de6\u53f324px\u306e\u4f59\u767d\u5206\u3082\u80cc\u666f\u304c\u5e83\u304c\u308b *\/\n  border-radius: 8px;\n}\n\n\/* \u30a4\u30f3\u30e9\u30a4\u30f3\u30cf\u30a4\u30e9\u30a4\u30c8 *\/\nmark {\n  background-color: #fef08a;  \/* \u9ec4\u8272\uff08\u30de\u30fc\u30ab\u30fc\u98a8\uff09 *\/\n  padding: 2px 4px;\n  border-radius: 3px;\n}<\/pre><\/div>\n\n\n\n<table>\n<thead><tr><th>UI\u8981\u7d20<\/th><th>\u63a8\u5968\u80cc\u666f\u8272<\/th><th>\u7406\u7531<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>\u30da\u30fc\u30b8\u5168\u4f53\uff08body\uff09<\/td><td>#ffffff \u307e\u305f\u306f #fafafa<\/td><td>\u767d\u30fb\u767d\u306b\u8fd1\u3044\u30b0\u30ec\u30fc\u3067\u8aad\u307f\u3084\u3059\u304f<\/td><\/tr>\n<tr><td>\u30d8\u30c3\u30c0\u30fc<\/td><td>#1a1a1a \u307e\u305f\u306f #dc2626<\/td><td>\u30c0\u30fc\u30af\u307e\u305f\u306f\u30d6\u30e9\u30f3\u30c9\u30ab\u30e9\u30fc\u3067\u5b58\u5728\u611f<\/td><\/tr>\n<tr><td>\u30ab\u30fc\u30c9<\/td><td>#ffffff + shadow<\/td><td>\u767d\u306b\u5f71\u3092\u3064\u3051\u3066\u6d6e\u304d\u4e0a\u304c\u308a\u611f<\/td><\/tr>\n<tr><td>\u30b3\u30fc\u30c9\u30d6\u30ed\u30c3\u30af<\/td><td>#1e1e1e<\/td><td>\u6fc3\u3044\u30b0\u30ec\u30fc\u3067\u30b3\u30fc\u30c9\u304c\u969b\u7acb\u3064<\/td><\/tr>\n<tr><td>\u30d2\u30fc\u30ed\u30fc\u30bb\u30af\u30b7\u30e7\u30f3<\/td><td>\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u307e\u305f\u306f\u30d6\u30e9\u30f3\u30c9\u30ab\u30e9\u30fc<\/td><td>\u6700\u521d\u306b\u76ee\u306b\u5165\u308b\u30bb\u30af\u30b7\u30e7\u30f3<\/td><\/tr>\n<tr><td>\u30d5\u30c3\u30bf\u30fc<\/td><td>#111827 \u307e\u305f\u306f #1a1a1a<\/td><td>\u30c0\u30fc\u30af\u3067\u7de0\u307e\u308a\u306e\u3042\u308b\u5370\u8c61<\/td><\/tr>\n<tr><td>\u6ce8\u610f\u30dc\u30c3\u30af\u30b9<\/td><td>rgba(220,38,38,0.05\u301c0.1)<\/td><td>\u30bd\u30d5\u30c8\u306a\u8d64\u3067\u76ee\u7acb\u305f\u305b\u308b<\/td><\/tr>\n<tr><td>\u6210\u529f\u30dc\u30c3\u30af\u30b9<\/td><td>rgba(22,163,74,0.05\u301c0.1)<\/td><td>\u30bd\u30d5\u30c8\u306a\u7dd1\u3067\u30dd\u30b8\u30c6\u30a3\u30d6\u306b<\/td><\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<div style=\"background:#f0fdf4;border:1px solid #22c55e;border-radius:8px;padding:20px 24px;margin:24px 0;\"><div style=\"display:flex;align-items:center;gap:8px;margin-bottom:12px;\"><span style=\"font-size:18px;\">&#128161;<\/span><strong style=\"color:#16a34a;font-size:15px;\">background-color\u3068border-radius\u306e\u7d44\u307f\u5408\u308f\u305b<\/strong><\/div><p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">background-color\u306bborder-radius\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3068\u3001\u89d2\u304c\u4e38\u3044\u30dc\u30c3\u30af\u30b9\u306b\u306a\u308a\u307e\u3059\u3002border-radius: 4px\u3067\u5c0f\u3055\u304f\u4e38\u304f\u30018\u301c12px\u3067\u30e2\u30c0\u30f3\u306a\u30ab\u30fc\u30c9\u98a8\u300150%\u307e\u305f\u306f9999px\u3067\u5b8c\u5168\u306a\u5186\/\u30ab\u30d7\u30bb\u30eb\u578b\u306b\u306a\u308a\u307e\u3059\u3002CTA\u30dc\u30bf\u30f3\u3084\u30d0\u30c3\u30b8\u30fb\u30bf\u30b0\u306e\u30c7\u30b6\u30a4\u30f3\u306b\u6b20\u304b\u305b\u306a\u3044\u30c6\u30af\u30cb\u30c3\u30af\u3067\u3059\u3002<\/p><\/div>\n\n\n\n<div class=\"balloon-wrap is-right\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/yamazaki-avatar.png\" alt=\"AI\u9b3c\u7ba1\u7406\u5c71\u5d0e\">\n    <span class=\"balloon-name\">AI\u9b3c\u7ba1\u7406\u5c71\u5d0e<\/span>\n  <\/div>\n  <div class=\"balloon-body\">background-color\u3068padding\u30fbborder-radius\u306e\u7d44\u307f\u5408\u308f\u305b\u306f\u3001Web\u30b5\u30a4\u30c8\u306e\u307b\u307c\u3059\u3079\u3066\u306e\u300c\u30dc\u30c3\u30af\u30b9\u8981\u7d20\u300d\u306b\u4f7f\u308f\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u306e3\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u30bb\u30c3\u30c8\u3092\u899a\u3048\u308c\u3070\u3001\u57fa\u672c\u7684\u306aUI\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306f\u81ea\u529b\u3067\u4f5c\u308c\u307e\u3059\u3002<\/div>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-css-background&#038;blog_slug=cc-css-background\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-css-background&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-06\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">06<\/span>\n  <span class=\"section-label\" style=\"display:block;\">HOVER EFFECT<\/span>\n  <span class=\"section-title\" style=\"display:block;\">hover\u6642\u306b\u80cc\u666f\u8272\u3092\u5909\u3048\u308b\uff08:hover\uff09<\/span>\n  <span class=\"section-desc\">\u30de\u30a6\u30b9\u30aa\u30fc\u30d0\u30fc\u3067\u8272\u304c\u5909\u308f\u308b\u30a4\u30f3\u30bf\u30e9\u30af\u30c6\u30a3\u30d6UI<\/span>\n<\/h2>\n\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #6b7280;border-radius:0 8px 8px 0;padding:16px 20px;margin:20px 0;\"><p style=\"margin:0 0 4px;font-size:13px;font-weight:700;color:#6b7280;letter-spacing:1px;\">&#128218; \u7528\u8a9e\u89e3\u8aac<\/p><p style=\"margin:0;font-size:15px;line-height:1.7;\"><strong>:hover \u64ec\u4f3c\u30af\u30e9\u30b9<\/strong>\uff1aCSS\u30bb\u30ec\u30af\u30bf\u30fc\u306e\u4e00\u7a2e\u3067\u3001\u30de\u30a6\u30b9\u30ab\u30fc\u30bd\u30eb\u304c\u8981\u7d20\u306e\u4e0a\u306b\u4e57\u3063\u3066\u3044\u308b\u3068\u304d\u3060\u3051\u9069\u7528\u3055\u308c\u307e\u3059\u3002\u300c\u30bb\u30ec\u30af\u30bf\u30fc:hover { \u30b9\u30bf\u30a4\u30eb }\u300d\u306e\u5f62\u5f0f\u3067\u8a18\u8ff0\u3057\u307e\u3059\u3002background-color\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u300c\u30de\u30a6\u30b9\u3092\u4e57\u305b\u308b\u3068\u80cc\u666f\u8272\u304c\u5909\u308f\u308b\u300d\u30a4\u30f3\u30bf\u30e9\u30af\u30c6\u30a3\u30d6\u306a\u52b9\u679c\u3092\u4f5c\u308c\u307e\u3059\u3002\u30dc\u30bf\u30f3\u30fb\u30ea\u30f3\u30af\u30fb\u30ca\u30d3\u30b2\u30fc\u30b7\u30e7\u30f3\u30fb\u30ab\u30fc\u30c9\u306a\u3069\u306eUX\u5411\u4e0a\u306b\u5fc5\u9808\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3067\u3059\u3002<\/p><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Web\u30b5\u30a4\u30c8\u3067\u300c\u30dc\u30bf\u30f3\u306b\u30de\u30a6\u30b9\u3092\u4e57\u305b\u308b\u3068\u8272\u304c\u5909\u308f\u308b\u300d\u3068\u3044\u3046\u52d5\u4f5c\u3092\u898b\u305f\u3053\u3068\u306f\u3042\u308b\u3067\u3057\u3087\u3046\u304b\u3002<br>\u3053\u308c\u306f<strong>CSS\u306e:hover\u64ec\u4f3c\u30af\u30e9\u30b9<\/strong>\u3092\u4f7f\u3063\u3066\u5b9f\u73fe\u3057\u3066\u3044\u307e\u3059\u3002<br>background-color\u3068:hover\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u7c21\u5358\u306b\u30a4\u30f3\u30bf\u30e9\u30af\u30c6\u30a3\u30d6\u306aUI\u304c\u4f5c\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* \u57fa\u672c\u306ehover\u30a8\u30d5\u30a7\u30af\u30c8 *\/\nbutton {\n  background-color: #dc2626;  \/* \u901a\u5e38\u6642\uff1a\u8d64 *\/\n  color: #ffffff;\n  padding: 12px 24px;\n  border: none;\n  border-radius: 8px;\n  cursor: pointer;\n}\n\nbutton:hover {\n  background-color: #b91c1c;  \/* \u30db\u30d0\u30fc\u6642\uff1a\u6fc3\u3044\u8d64 *\/\n}\n\n\/* transition\u3067\u6ed1\u3089\u304b\u306b *\/\nbutton {\n  background-color: #dc2626;\n  color: #ffffff;\n  padding: 12px 24px;\n  border: none;\n  border-radius: 8px;\n  cursor: pointer;\n  transition: background-color 0.2s ease;  \/* 0.2\u79d2\u3067\u306a\u3081\u3089\u304b\u306b\u5909\u5316 *\/\n}\n\nbutton:hover {\n  background-color: #b91c1c;\n}<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">transition\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u8ffd\u52a0\u3059\u308b\u3068\u3001\u8272\u306e\u5909\u5316\u304c<strong>\u306a\u3081\u3089\u304b\u306a\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3<\/strong>\u306b\u306a\u308a\u307e\u3059\u3002<br>\u300c0.2s ease\u300d\u306f\u300c0.2\u79d2\u304b\u3051\u3066\u30a4\u30fc\u30b8\u30f3\u30b0\uff08\u81ea\u7136\u306a\u52a0\u901f\u30fb\u6e1b\u901f\uff09\u3067\u5909\u5316\u3059\u308b\u300d\u3068\u3044\u3046\u610f\u5473\u3067\u3059\u3002<br>\u3053\u308c\u3060\u3051\u3067UI\u306e\u5b8c\u6210\u5ea6\u304c\u5927\u304d\u304f\u4e0a\u304c\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30dc\u30bf\u30f3\u4ee5\u5916\u306b\u3082\u30db\u30d0\u30fc\u30a8\u30d5\u30a7\u30af\u30c8\u306f\u3055\u307e\u3056\u307e\u306a\u5834\u9762\u3067\u4f7f\u3048\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* \u30ca\u30d3\u30b2\u30fc\u30b7\u30e7\u30f3\u30ea\u30f3\u30af *\/\nnav a {\n  background-color: transparent;\n  color: #1a1a1a;\n  padding: 8px 16px;\n  text-decoration: none;\n  border-radius: 6px;\n  transition: background-color 0.15s ease;\n}\n\nnav a:hover {\n  background-color: rgba(0, 0, 0, 0.06);  \/* \u8584\u3044\u9ed2\u3067\u6d6e\u304d\u4e0a\u304c\u308a\u611f *\/\n}\n\n\/* \u30c6\u30fc\u30d6\u30eb\u884c\u306ehover *\/\ntr {\n  transition: background-color 0.15s ease;\n}\n\ntr:hover {\n  background-color: rgba(37, 99, 235, 0.04);  \/* \u8584\u3044\u9752 *\/\n}\n\n\/* \u30ab\u30fc\u30c9\u306ehover *\/\n.card {\n  background-color: #ffffff;\n  border-radius: 12px;\n  padding: 24px;\n  box-shadow: 0 2px 8px rgba(0,0,0,0.08);\n  transition: background-color 0.2s ease, box-shadow 0.2s ease;\n}\n\n.card:hover {\n  background-color: #fafafa;  \/* \u308f\u305a\u304b\u306b\u6697\u304f *\/\n  box-shadow: 0 8px 24px rgba(0,0,0,0.15);  \/* \u5f71\u3092\u5f37\u304f *\/\n}<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u30a2\u30a6\u30c8\u30e9\u30a4\u30f3\u30b9\u30bf\u30a4\u30eb\uff08\u5916\u67a0\u3060\u3051\u306e\u30dc\u30bf\u30f3\uff09\u306ehover\u30d1\u30bf\u30fc\u30f3\u3082\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<br>\u901a\u5e38\u6642\u306f\u900f\u660e\u80cc\u666f\u30fb\u6709\u8272\u30dc\u30fc\u30c0\u30fc\u3067\u3001\u30db\u30d0\u30fc\u6642\u306b\u80cc\u666f\u8272\u304c\u5857\u3089\u308c\u308b\u30c7\u30b6\u30a4\u30f3\u3067\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* \u30a2\u30a6\u30c8\u30e9\u30a4\u30f3\u30dc\u30bf\u30f3\u306ehover *\/\n.btn-outline {\n  background-color: transparent;  \/* \u901a\u5e38\u6642\uff1a\u900f\u660e *\/\n  color: #dc2626;\n  border: 2px solid #dc2626;\n  padding: 12px 24px;\n  border-radius: 8px;\n  cursor: pointer;\n  transition: background-color 0.2s ease, color 0.2s ease;\n}\n\n.btn-outline:hover {\n  background-color: #dc2626;  \/* \u30db\u30d0\u30fc\u6642\uff1a\u8d64\u3067\u5857\u308a\u3064\u3076\u3059 *\/\n  color: #ffffff;             \/* \u6587\u5b57\u8272\u3082\u767d\u306b\u5207\u308a\u66ff\u3048 *\/\n}<\/pre><\/div>\n\n\n\n<table>\n<thead><tr><th>\u30d1\u30bf\u30fc\u30f3<\/th><th>\u901a\u5e38\u6642<\/th><th>\u30db\u30d0\u30fc\u6642<\/th><th>\u7528\u9014<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>\u901a\u5e38\u30dc\u30bf\u30f3\uff08filled\uff09<\/td><td>\u5857\u308a\u3064\u3076\u3057\u8272<\/td><td>\u3088\u308a\u6fc3\u3044\u540c\u7cfb\u8272<\/td><td>\u4e3b\u8981CTA\u30fb\u9001\u4fe1\u30dc\u30bf\u30f3<\/td><\/tr>\n<tr><td>\u30a2\u30a6\u30c8\u30e9\u30a4\u30f3\u30dc\u30bf\u30f3<\/td><td>\u900f\u660e\u80cc\u666f<\/td><td>\u5857\u308a\u3064\u3076\u3057\u8272<\/td><td>\u30b5\u30d6\u30a2\u30af\u30b7\u30e7\u30f3\u30fb\u30ad\u30e3\u30f3\u30bb\u30eb<\/td><\/tr>\n<tr><td>\u30c6\u30ad\u30b9\u30c8\u30ea\u30f3\u30af<\/td><td>\u900f\u660e\u80cc\u666f<\/td><td>\u8584\u3044\u80cc\u666f\u8272<\/td><td>\u30ca\u30d3\u30fb\u30a2\u30f3\u30ab\u30fc<\/td><\/tr>\n<tr><td>\u30ab\u30fc\u30c9<\/td><td>\u767d\u80cc\u666f<\/td><td>\u8584\u3044\u30b0\u30ec\u30fc\u80cc\u666f<\/td><td>\u30af\u30ea\u30c3\u30ab\u30d6\u30eb\u306a\u30ab\u30fc\u30c9<\/td><\/tr>\n<tr><td>\u30c6\u30fc\u30d6\u30eb\u884c<\/td><td>\u767d\u80cc\u666f<\/td><td>\u8584\u3044\u9752\u80cc\u666f<\/td><td>\u9078\u629e\u53ef\u80fd\u306a\u884c<\/td><\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<div style=\"background:#f0fdf4;border:1px solid #22c55e;border-radius:8px;padding:20px 24px;margin:24px 0;\"><div style=\"display:flex;align-items:center;gap:8px;margin-bottom:12px;\"><span style=\"font-size:18px;\">&#128161;<\/span><strong style=\"color:#16a34a;font-size:15px;\">transition: background-color \u306f\u5fc5\u305a\u5165\u308c\u3088\u3046<\/strong><\/div><p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">hover\u3067\u8272\u3092\u5909\u3048\u308b\u3060\u3051\u3067\u306f\u300c\u30d1\u30c3\u300d\u3068\u77ac\u6642\u306b\u5909\u308f\u3063\u3066\u3057\u307e\u3044\u3001\u5c11\u3057\u91ce\u66ae\u3063\u305f\u3044\u5370\u8c61\u306b\u306a\u308a\u307e\u3059\u3002transition: background-color 0.2s ease; \u3092\u5143\u306e\u30b9\u30bf\u30a4\u30eb\u306b\u8ffd\u52a0\u3059\u308b\u3060\u3051\u3067\u3001\u306a\u3081\u3089\u304b\u306a\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u4ed8\u304d\u306e\u6d17\u7df4\u3055\u308c\u305f\u30db\u30d0\u30fc\u30a8\u30d5\u30a7\u30af\u30c8\u306b\u306a\u308a\u307e\u3059\u30020.15\u301c0.25\u79d2\u304c\u81ea\u7136\u306b\u898b\u3048\u308b\u304a\u3059\u3059\u3081\u306e\u6642\u9593\u3067\u3059\u3002<\/p><\/div>\n\n\n\n<div style=\"background:#fef2f2;border:2px solid #dc2626;border-radius:8px;padding:20px 24px;margin:24px 0;\"><div style=\"display:flex;align-items:center;gap:8px;margin-bottom:12px;\"><span style=\"font-size:20px;\">&#9888;&#65039;<\/span><strong style=\"color:#dc2626;font-size:16px;\">:hover\u306f\u30bf\u30c3\u30c1\u30c7\u30d0\u30a4\u30b9\u3067\u306f\u6a5f\u80fd\u3057\u306a\u3044<\/strong><\/div><p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">:hover\u306e\u80cc\u666f\u8272\u5909\u5316\u306f\u30de\u30a6\u30b9\u3092\u4f7f\u3046PC\u3067\u306f\u5feb\u9069\u3067\u3059\u304c\u3001\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u30fb\u30bf\u30d6\u30ec\u30c3\u30c8\u306a\u3069\u306e\u30bf\u30c3\u30c1\u30c7\u30d0\u30a4\u30b9\u3067\u306f\u30db\u30d0\u30fc\u72b6\u614b\u304c\u767a\u751f\u3057\u307e\u305b\u3093\uff08\u30bf\u30c3\u30d7\u6642\u306b\u4e00\u77ac\u9069\u7528\u3055\u308c\u308b\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u304c\u5b89\u5b9a\u3057\u307e\u305b\u3093\uff09\u3002\u30bf\u30c3\u30c1\u30c7\u30d0\u30a4\u30b9\u5411\u3051\u306e\u30a2\u30af\u30c6\u30a3\u30d6\u72b6\u614b\u306b\u306f:active\u3092\u4f7f\u3044\u307e\u3057\u3087\u3046\u3002<\/p><\/div>\n\n\n\n<div class=\"balloon-wrap\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/ceo-sugasawa.jpg\" alt=\"\u4ee3\u8868\u83c5\u6fa4\">\n    <span class=\"balloon-name\">\u4ee3\u8868\u83c5\u6fa4<\/span>\n  <\/div>\n  <div class=\"balloon-body\">background-color + transition + :hover \u306e3\u70b9\u30bb\u30c3\u30c8\u306f\u3001\u30d7\u30ed\u306eWeb\u5236\u4f5c\u8005\u304c\u6bce\u65e5\u4f7f\u3046\u30c6\u30af\u30cb\u30c3\u30af\u3067\u3059\u3002\u3053\u308c\u3092\u77e5\u3063\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3067\u3001UI\u306e\u5b8c\u6210\u5ea6\u304c\u4e00\u6bb5\u4e0a\u304c\u308a\u307e\u3059\u3002<\/div>\n<\/div>\n\n\n\n<div class=\"balloon-wrap is-right\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/yamazaki-avatar.png\" alt=\"AI\u9b3c\u7ba1\u7406\u5c71\u5d0e\">\n    <span class=\"balloon-name\">AI\u9b3c\u7ba1\u7406\u5c71\u5d0e<\/span>\n  <\/div>\n  <div class=\"balloon-body\">transition\u306e\u79d2\u6570\u306f\u77ed\u3059\u304e\u308b\u3068\u6c17\u3065\u304b\u308c\u305a\u3001\u9577\u3059\u304e\u308b\u3068\u30e2\u30bf\u3064\u304f\u5370\u8c61\u306b\u306a\u308a\u307e\u3059\u30020.15\u301c0.25\u79d2\u304c\u300c\u52d5\u3044\u3066\u3044\u308b\u3068\u308f\u304b\u308b\u3051\u3069\u90aa\u9b54\u306b\u306a\u3089\u306a\u3044\u300d\u7d76\u5999\u306a\u30e9\u30a4\u30f3\u3067\u3059\u3002<\/div>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-css-background&#038;blog_slug=cc-css-background\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-css-background&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-07\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">07<\/span>\n  <span class=\"section-label\" style=\"display:block;\">SECTION DESIGN<\/span>\n  <span class=\"section-title\" style=\"display:block;\">\u30bb\u30af\u30b7\u30e7\u30f3\u5225\u306e\u80cc\u666f\u8272\u3067\u30c7\u30b6\u30a4\u30f3\u306b\u30e1\u30ea\u30cf\u30ea<\/span>\n  <span class=\"section-desc\">\u60c5\u5831\u3092\u533a\u5207\u308a\u8996\u899a\u7684\u306a\u30ea\u30ba\u30e0\u3092\u751f\u307f\u51fa\u3059<\/span>\n<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Web\u30b5\u30a4\u30c8\u306e\u7e26\u30b9\u30af\u30ed\u30fc\u30eb\u3067\u300c\u60c5\u5831\u306e\u533a\u5207\u308a\u300d\u3092\u8996\u899a\u7684\u306b\u4f1d\u3048\u308b\u65b9\u6cd5\u3068\u3057\u3066\u3001<br><strong>\u30bb\u30af\u30b7\u30e7\u30f3\u3054\u3068\u306b\u80cc\u666f\u8272\u3092\u5909\u3048\u308b<\/strong>\u30c6\u30af\u30cb\u30c3\u30af\u304c\u3042\u308a\u307e\u3059\u3002<br>\u767d\u30fb\u8584\u3044\u30b0\u30ec\u30fc\u30fb\u30d6\u30e9\u30f3\u30c9\u30ab\u30e9\u30fc\u30fb\u30c0\u30fc\u30af\u3092\u4ea4\u4e92\u306b\u4f7f\u3046\u3053\u3068\u3067\u3001\u81ea\u7136\u306a\u30ea\u30ba\u30e0\u304c\u751f\u307e\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee3\u8868\u7684\u306a\u30bb\u30af\u30b7\u30e7\u30f3\u914d\u8272\u30d1\u30bf\u30fc\u30f3\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* \u30bb\u30af\u30b7\u30e7\u30f3\u5225\u80cc\u666f\u8272\u306e\u5178\u578b\u30d1\u30bf\u30fc\u30f3 *\/\n\n\/* \u30d2\u30fc\u30ed\u30fc\u30bb\u30af\u30b7\u30e7\u30f3 *\/\n.section-hero {\n  background-color: #1a1a1a;  \/* \u30c0\u30fc\u30af *\/\n  color: #ffffff;\n}\n\n\/* \u7279\u5fb4\u7d39\u4ecb\u30bb\u30af\u30b7\u30e7\u30f3 *\/\n.section-features {\n  background-color: #ffffff;  \/* \u767d\uff08\u30c7\u30d5\u30a9\u30eb\u30c8\uff09 *\/\n}\n\n\/* \u5b9f\u7e3e\u30fb\u6570\u5b57\u30bb\u30af\u30b7\u30e7\u30f3 *\/\n.section-stats {\n  background-color: #f9fafb;  \/* \u8584\u3044\u30b0\u30ec\u30fc *\/\n}\n\n\/* CTA\u30bb\u30af\u30b7\u30e7\u30f3 *\/\n.section-cta {\n  background-color: #dc2626;  \/* \u30d6\u30e9\u30f3\u30c9\u30ab\u30e9\u30fc\uff08\u8d64\uff09 *\/\n  color: #ffffff;\n}\n\n\/* \u6599\u91d1\u30d7\u30e9\u30f3\u30bb\u30af\u30b7\u30e7\u30f3 *\/\n.section-pricing {\n  background-color: #ffffff;\n}\n\n\/* FAQ\u30bb\u30af\u30b7\u30e7\u30f3 *\/\n.section-faq {\n  background-color: #f9fafb;\n}\n\n\/* \u30d5\u30c3\u30bf\u30fc *\/\nfooter {\n  background-color: #111827;  \/* \u30c0\u30fc\u30af\u30cd\u30a4\u30d3\u30fc *\/\n  color: #e5e7eb;\n}<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u30bb\u30af\u30b7\u30e7\u30f3\u914d\u8272\u3092\u8a2d\u8a08\u3059\u308b\u3068\u304d\u306e\u57fa\u672c\u30eb\u30fc\u30eb\u304c\u3042\u308a\u307e\u3059\u3002<br>\u300c<strong>\u767d\u2192\u30b0\u30ec\u30fc\u2192\u767d\u2192\u30ab\u30e9\u30fc\u2192\u767d<\/strong>\u300d\u3068\u3044\u3046\u30ea\u30ba\u30e0\u3092\u7e70\u308a\u8fd4\u3059\u3060\u3051\u3067\u3082\u3001\u307e\u3068\u307e\u3063\u305f\u30c7\u30b6\u30a4\u30f3\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"g-flow-row\" style=\"margin:24px 0;\">\n  <div class=\"g-flow-item\">\u30d2\u30fc\u30ed\u30fc<br><small>\u30c0\u30fc\u30af\/\u30ab\u30e9\u30fc<\/small><\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">\u7279\u5fb4<br><small>\u767d<\/small><\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">\u5b9f\u7e3e<br><small>\u8584\u30b0\u30ec\u30fc<\/small><\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">CTA<br><small>\u30d6\u30e9\u30f3\u30c9\u30ab\u30e9\u30fc<\/small><\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">FAQ<br><small>\u8584\u30b0\u30ec\u30fc<\/small><\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">\u30d5\u30c3\u30bf\u30fc<br><small>\u30c0\u30fc\u30af<\/small><\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">CSS\u5909\u6570\uff08\u30ab\u30b9\u30bf\u30e0\u30d7\u30ed\u30d1\u30c6\u30a3\uff09\u3067\u30bb\u30af\u30b7\u30e7\u30f3\u80cc\u666f\u8272\u3092\u7ba1\u7406\u3059\u308b\u3068\u3001<br>\u3042\u3068\u304b\u3089\u4e00\u62ec\u5909\u66f4\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* CSS\u5909\u6570\u3067\u30bb\u30af\u30b7\u30e7\u30f3\u80cc\u666f\u3092\u7ba1\u7406 *\/\n:root {\n  --bg-page: #ffffff;\n  --bg-subtle: #f9fafb;\n  --bg-dark: #111827;\n  --bg-brand: #dc2626;\n  --bg-brand-subtle: rgba(220, 38, 38, 0.05);\n}\n\n.section-features { background-color: var(--bg-page); }\n.section-stats    { background-color: var(--bg-subtle); }\n.section-cta      { background-color: var(--bg-brand); color: #fff; }\n.section-faq      { background-color: var(--bg-subtle); }\nfooter            { background-color: var(--bg-dark); color: #e5e7eb; }\n\n\/* \u30c6\u30fc\u30de\u30ab\u30e9\u30fc\u3092\u5909\u3048\u305f\u3044\u3068\u304d\u306f:root\u306e\u5909\u6570\u3060\u3051\u4fee\u6b63\u3059\u308c\u3070OK *\/\n\/* --bg-brand: #2563eb; \u306b\u5909\u3048\u308b\u3068\u5168\u30bb\u30af\u30b7\u30e7\u30f3\u306e\u30d6\u30e9\u30f3\u30c9\u30ab\u30e9\u30fc\u304c\u9752\u306b\u5207\u308a\u66ff\u308f\u308b *\/<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u30c0\u30fc\u30af\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f<strong>\u30c6\u30ad\u30b9\u30c8\u306e\u8272\u3082\u540c\u6642\u306b\u5909\u3048\u308b<\/strong>\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<br>\u80cc\u666f\u304c\u6697\u3044\u5834\u5408\u306f\u6587\u5b57\u3092\u767d\u7cfb\u306b\u3001\u80cc\u666f\u304c\u660e\u308b\u3044\u5834\u5408\u306f\u6587\u5b57\u3092\u9ed2\u7cfb\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* \u30c0\u30fc\u30af\u30bb\u30af\u30b7\u30e7\u30f3\u5185\u306e\u30c6\u30ad\u30b9\u30c8\u8272 *\/\n.section-dark {\n  background-color: #111827;\n  color: #e5e7eb;          \/* \u30c6\u30ad\u30b9\u30c8\u3092\u767d\u7cfb\u306b *\/\n}\n\n.section-dark h2 {\n  color: #f9fafb;          \/* \u898b\u51fa\u3057\u306f\u3088\u308a\u660e\u308b\u304f *\/\n}\n\n.section-dark p {\n  color: #d1d5db;          \/* \u672c\u6587\u306f\u5c11\u3057\u843d\u3061\u7740\u3044\u305f\u767d *\/\n}\n\n.section-dark a {\n  color: #60a5fa;          \/* \u30ea\u30f3\u30af\u306f\u9752\u3088\u308a\u660e\u308b\u304f *\/\n}<\/pre><\/div>\n\n\n\n<table>\n<thead><tr><th>\u30bb\u30af\u30b7\u30e7\u30f3\u30bf\u30a4\u30d7<\/th><th>\u63a8\u5968\u80cc\u666f\u8272<\/th><th>\u6587\u5b57\u8272<\/th><th>\u52b9\u679c<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>\u30d2\u30fc\u30ed\u30fc\uff08FV\uff09<\/td><td>#1a1a1a \u307e\u305f\u306f \u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3<\/td><td>#ffffff<\/td><td>\u6700\u521d\u306e\u30a4\u30f3\u30d1\u30af\u30c8<\/td><\/tr>\n<tr><td>\u7279\u5fb4\u8aac\u660e<\/td><td>#ffffff<\/td><td>#1f2937<\/td><td>\u6e05\u6f54\u611f\u30fb\u8aad\u307f\u3084\u3059\u3055<\/td><\/tr>\n<tr><td>\u6570\u5024\u30fb\u5b9f\u7e3e<\/td><td>#f9fafb<\/td><td>#1f2937<\/td><td>\u8efd\u3044\u533a\u5207\u308a<\/td><\/tr>\n<tr><td>CTA\u30fb\u8a34\u6c42<\/td><td>#dc2626\uff08\u30d6\u30e9\u30f3\u30c9\u30ab\u30e9\u30fc\uff09<\/td><td>#ffffff<\/td><td>\u884c\u52d5\u3092\u4fc3\u3059\u5f37\u8abf<\/td><\/tr>\n<tr><td>\u304a\u5ba2\u69d8\u306e\u58f0<\/td><td>#f8f9fa \u307e\u305f\u306f #fafafa<\/td><td>#1f2937<\/td><td>\u4e2d\u7acb\u7684\u30fb\u4fe1\u983c\u611f<\/td><\/tr>\n<tr><td>FAQ<\/td><td>#f9fafb<\/td><td>#1f2937<\/td><td>\u30b3\u30f3\u30c6\u30f3\u30c4\u533a\u5207\u308a<\/td><\/tr>\n<tr><td>\u30d5\u30c3\u30bf\u30fc<\/td><td>#111827 \u307e\u305f\u306f #1a1a1a<\/td><td>#e5e7eb<\/td><td>\u7de0\u307e\u3063\u305f\u7d42\u308f\u308a\u611f<\/td><\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<div style=\"background:#f0fdf4;border:1px solid #22c55e;border-radius:8px;padding:20px 24px;margin:24px 0;\"><div style=\"display:flex;align-items:center;gap:8px;margin-bottom:12px;\"><span style=\"font-size:18px;\">&#128161;<\/span><strong style=\"color:#16a34a;font-size:15px;\">\u30cd\u30ac\u30c6\u30a3\u30d6\u30b9\u30da\u30fc\u30b9\u3092\u6d3b\u7528\u3059\u308b<\/strong><\/div><p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">\u3059\u3079\u3066\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u306b\u80cc\u666f\u8272\u3092\u3064\u3051\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u767d\uff08#ffffff\uff09\u306e\u307e\u307e\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3092\u610f\u56f3\u7684\u306b\u631f\u3080\u3053\u3068\u3067\u3001\u30ab\u30e9\u30fc\u30bb\u30af\u30b7\u30e7\u30f3\u304c\u969b\u7acb\u3061\u307e\u3059\u3002\u300c\u767d\u2192\u30b0\u30ec\u30fc\u2192\u767d\u2192\u30ab\u30e9\u30fc\u300d\u306e\u30ea\u30ba\u30e0\u304c\u3001\u30e1\u30ea\u30cf\u30ea\u306e\u3042\u308b\u30da\u30fc\u30b8\u30c7\u30b6\u30a4\u30f3\u306e\u57fa\u672c\u3067\u3059\u3002<\/p><\/div>\n\n\n\n<div class=\"balloon-wrap is-right\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/yamazaki-avatar.png\" alt=\"AI\u9b3c\u7ba1\u7406\u5c71\u5d0e\">\n    <span class=\"balloon-name\">AI\u9b3c\u7ba1\u7406\u5c71\u5d0e<\/span>\n  <\/div>\n  <div class=\"balloon-body\">\u30bb\u30af\u30b7\u30e7\u30f3\u306e\u80cc\u666f\u8272\u3092\u4ea4\u4e92\u306b\u5909\u3048\u308b\u3060\u3051\u3067\u3001\u30b9\u30af\u30ed\u30fc\u30eb\u3057\u305f\u6642\u306e\u300c\u3053\u3053\u304b\u3089\u65b0\u3057\u3044\u8a71\u984c\u304c\u59cb\u307e\u308b\u300d\u3068\u3044\u3046\u611f\u899a\u304c\u751f\u307e\u308c\u307e\u3059\u3002\u30c6\u30ad\u30b9\u30c8\u3067\u533a\u5207\u308b\u3088\u308a\u8996\u899a\u7684\u306a\u533a\u5207\u308a\u306e\u307b\u3046\u304c\u76f4\u611f\u7684\u306b\u4f1d\u308f\u308a\u307e\u3059\u306d\u3002<\/div>\n<\/div>\n\n\n\n<div class=\"balloon-wrap\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/ceo-sugasawa.jpg\" alt=\"\u4ee3\u8868\u83c5\u6fa4\">\n    <span class=\"balloon-name\">\u4ee3\u8868\u83c5\u6fa4<\/span>\n  <\/div>\n  <div class=\"balloon-body\">LP\uff08\u30e9\u30f3\u30c7\u30a3\u30f3\u30b0\u30da\u30fc\u30b8\uff09\u3067\u306f\u7279\u306b\u3001CTA\u90e8\u5206\u306e\u80cc\u666f\u3092\u30d6\u30e9\u30f3\u30c9\u30ab\u30e9\u30fc\u306b\u3059\u308b\u3060\u3051\u3067\u30b3\u30f3\u30d0\u30fc\u30b8\u30e7\u30f3\u7387\u304c\u4e0a\u304c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u76ee\u7acb\u305f\u305b\u305f\u3044\u30bb\u30af\u30b7\u30e7\u30f3\u306b\u8272\u3092\u4f7f\u3046\u306e\u304c\u9244\u5247\u3067\u3059\u3002<\/div>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-css-background&#038;blog_slug=cc-css-background\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-css-background&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-08\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">08<\/span>\n  <span class=\"section-label\" style=\"display:block;\">DARK MODE<\/span>\n  <span class=\"section-title\" style=\"display:block;\">\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u5bfe\u5fdc<\/span>\n  <span class=\"section-desc\">prefers-color-scheme\u3067\u81ea\u52d5\u5207\u308a\u66ff\u3048<\/span>\n<\/h2>\n\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #6b7280;border-radius:0 8px 8px 0;padding:16px 20px;margin:20px 0;\"><p style=\"margin:0 0 4px;font-size:13px;font-weight:700;color:#6b7280;letter-spacing:1px;\">&#128218; \u7528\u8a9e\u89e3\u8aac<\/p><p style=\"margin:0;font-size:15px;line-height:1.7;\"><strong>prefers-color-scheme \u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea<\/strong>\uff1a\u30e6\u30fc\u30b6\u30fc\u306eOS\u307e\u305f\u306f\u30d6\u30e9\u30a6\u30b6\u306e\u30ab\u30e9\u30fc\u30e2\u30fc\u30c9\u8a2d\u5b9a\uff08\u30e9\u30a4\u30c8\/\u30c0\u30fc\u30af\uff09\u3092\u691c\u77e5\u3059\u308bCSS\u306e\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3002@media (prefers-color-scheme: dark) \u30d6\u30ed\u30c3\u30af\u5185\u306b\u30b9\u30bf\u30a4\u30eb\u3092\u66f8\u304f\u3068\u3001\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u306b\u8a2d\u5b9a\u3057\u3066\u3044\u308b\u30e6\u30fc\u30b6\u30fc\u306b\u81ea\u52d5\u3067\u305d\u306e\u30b9\u30bf\u30a4\u30eb\u304c\u9069\u7528\u3055\u308c\u307e\u3059\u3002\u73fe\u4ee3\u306eWeb\u30b5\u30a4\u30c8\u3067\u306f\u5fc5\u9808\u306e\u5bfe\u5fdc\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u3084\u30d1\u30bd\u30b3\u30f3\u306eOS\u306b\u306f\u300c\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u300d\u8a2d\u5b9a\u304c\u3042\u308a\u3001<br>\u3053\u306e\u30e2\u30fc\u30c9\u3092ON\u306b\u3057\u3066\u3044\u308b\u30e6\u30fc\u30b6\u30fc\u306f\u5897\u3048\u7d9a\u3051\u3066\u3044\u307e\u3059\u3002<br>background-color\u3092<strong>\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u306b\u5bfe\u5fdc\u3055\u305b\u308b<\/strong>\u3053\u3068\u3067\u3001\u3059\u3079\u3066\u306e\u30e6\u30fc\u30b6\u30fc\u306b\u5feb\u9069\u306a\u95b2\u89a7\u4f53\u9a13\u3092\u63d0\u4f9b\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u5bfe\u5fdc\u306eCSS\u3092\u66f8\u3044\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* \u30e9\u30a4\u30c8\u30e2\u30fc\u30c9\uff08\u30c7\u30d5\u30a9\u30eb\u30c8\uff09 *\/\nbody {\n  background-color: #ffffff;\n  color: #1f2937;\n}\n\n.card {\n  background-color: #ffffff;\n  border: 1px solid #e5e7eb;\n}\n\n.hero {\n  background-color: #f9fafb;\n}\n\n\/* \u30c0\u30fc\u30af\u30e2\u30fc\u30c9\uff08OS\u304c\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u306e\u5834\u5408\u306b\u81ea\u52d5\u9069\u7528\uff09 *\/\n@media (prefers-color-scheme: dark) {\n  body {\n    background-color: #111827;  \/* \u6fc3\u3044\u30cd\u30a4\u30d3\u30fc *\/\n    color: #f3f4f6;\n  }\n\n  .card {\n    background-color: #1f2937;  \/* \u5c11\u3057\u660e\u308b\u3044\u30cd\u30a4\u30d3\u30fc *\/\n    border: 1px solid #374151;\n  }\n\n  .hero {\n    background-color: #0f172a;  \/* \u3088\u308a\u6fc3\u3044\u30cd\u30a4\u30d3\u30fc *\/\n  }\n}<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">CSS\u5909\u6570\uff08\u30ab\u30b9\u30bf\u30e0\u30d7\u30ed\u30d1\u30c6\u30a3\uff09\u3092\u4f7f\u3046\u3068\u3001\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u5bfe\u5fdc\u304c\u3088\u308a\u30b7\u30f3\u30d7\u30eb\u306b\u66f8\u3051\u307e\u3059\u3002<br>\u30e9\u30a4\u30c8\/\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u306e\u5207\u308a\u66ff\u3048\u306f\u5909\u6570\u306e\u5024\u3060\u3051\u3092\u5909\u3048\u3066\u3001\u672c\u6587\u30b9\u30bf\u30a4\u30eb\u3067\u306f\u5909\u6570\u3092\u53c2\u7167\u3059\u308b\u3060\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* CSS\u5909\u6570\u306b\u3088\u308b\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u5bfe\u5fdc\uff08\u63a8\u5968\u30d1\u30bf\u30fc\u30f3\uff09 *\/\n:root {\n  \/* \u30e9\u30a4\u30c8\u30e2\u30fc\u30c9\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u5024 *\/\n  --bg-page: #ffffff;\n  --bg-card: #ffffff;\n  --bg-subtle: #f9fafb;\n  --bg-header: #1a1a1a;\n  --text-primary: #1f2937;\n  --text-secondary: #6b7280;\n  --border-color: #e5e7eb;\n}\n\n@media (prefers-color-scheme: dark) {\n  :root {\n    \/* \u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u306e\u5024\u306b\u4e0a\u66f8\u304d *\/\n    --bg-page: #111827;\n    --bg-card: #1f2937;\n    --bg-subtle: #0f172a;\n    --bg-header: #0f172a;\n    --text-primary: #f3f4f6;\n    --text-secondary: #9ca3af;\n    --border-color: #374151;\n  }\n}\n\n\/* \u672c\u6587\u30b9\u30bf\u30a4\u30eb\u3067\u306f\u5909\u6570\u3092\u53c2\u7167\u3059\u308b\u3060\u3051 *\/\nbody {\n  background-color: var(--bg-page);\n  color: var(--text-primary);\n}\n\n.card {\n  background-color: var(--bg-card);\n  border: 1px solid var(--border-color);\n}\n\nheader {\n  background-color: var(--bg-header);\n}<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u306e\u30ab\u30e9\u30fc\u30d1\u30ec\u30c3\u30c8\u8a2d\u8a08\u306b\u306f\u30b3\u30c4\u304c\u3042\u308a\u307e\u3059\u3002<br>\u30e9\u30a4\u30c8\u30e2\u30fc\u30c9\u306e\u300c\u9ed2\u301c\u767d\u306e\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u300d\u3092\u3001<br>\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u3067\u306f\u300c\u767d\u301c\u9ed2\u306e\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u300d\u306b\u53cd\u8ee2\u3055\u305b\u308b\u30a4\u30e1\u30fc\u30b8\u3067\u3059\u3002<\/p>\n\n\n\n<table>\n<thead><tr><th>\u7528\u9014<\/th><th>\u30e9\u30a4\u30c8\u30e2\u30fc\u30c9<\/th><th>\u30c0\u30fc\u30af\u30e2\u30fc\u30c9<\/th><th>\u5f79\u5272<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>\u30da\u30fc\u30b8\u80cc\u666f<\/td><td>#ffffff\uff08\u7d14\u767d\uff09<\/td><td>#111827\uff08\u6fc3\u3044\u30cd\u30a4\u30d3\u30fc\uff09<\/td><td>\u30d9\u30fc\u30b9\u80cc\u666f<\/td><\/tr>\n<tr><td>\u30ab\u30fc\u30c9\u30fb\u30e2\u30b8\u30e5\u30fc\u30eb<\/td><td>#ffffff + shadow<\/td><td>#1f2937\uff08\u3084\u3084\u660e\u308b\u3044\u30cd\u30a4\u30d3\u30fc\uff09<\/td><td>\u80cc\u666f\u3088\u308a\u4e00\u6bb5\u660e\u308b\u304f<\/td><\/tr>\n<tr><td>\u30b5\u30a4\u30c9\u30d0\u30fc\u30fb\u30b5\u30d6\u80cc\u666f<\/td><td>#f9fafb<\/td><td>#0f172a\uff08\u3088\u308a\u6fc3\u3044\uff09<\/td><td>\u80cc\u666f\u3088\u308a\u4e00\u6bb5\u6697\u304f<\/td><\/tr>\n<tr><td>\u30dc\u30fc\u30c0\u30fc<\/td><td>#e5e7eb<\/td><td>#374151<\/td><td>\u5883\u754c\u7dda<\/td><\/tr>\n<tr><td>\u672c\u6587\u30c6\u30ad\u30b9\u30c8<\/td><td>#1f2937\uff08\u6fc3\u3044\u30b0\u30ec\u30fc\uff09<\/td><td>#f3f4f6\uff08\u8584\u3044\u30b0\u30ec\u30fc\uff09<\/td><td>\u8aad\u307f\u3084\u3059\u3044\u5bfe\u6bd4<\/td><\/tr>\n<tr><td>\u88dc\u8db3\u30c6\u30ad\u30b9\u30c8<\/td><td>#6b7280<\/td><td>#9ca3af<\/td><td>\u30b5\u30d6\u60c5\u5831<\/td><\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<div class=\"step-item\"><div class=\"step-num\">1<\/div><div class=\"step-content\"><strong>CSS\u5909\u6570\u3067\u30ab\u30e9\u30fc\u30d1\u30ec\u30c3\u30c8\u3092\u5b9a\u7fa9\u3059\u308b<\/strong>:root\u306b--bg-page, --text-primary\u306a\u3069\u610f\u5473\u306e\u3042\u308b\u5909\u6570\u540d\u3067\u5b9a\u7fa9<\/div><\/div>\n<div class=\"step-item\"><div class=\"step-num\">2<\/div><div class=\"step-content\"><strong>@media (prefers-color-scheme: dark) \u3067\u5909\u6570\u3092\u4e0a\u66f8\u304d\u3059\u308b<\/strong>\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u7528\u306e\u5024\u3060\u3051\u5dee\u3057\u66ff\u3048\u308b\u306e\u3067\u8a18\u8ff0\u91cf\u304c\u5c11\u306a\u3044<\/div><\/div>\n<div class=\"step-item\"><div class=\"step-num\">3<\/div><div class=\"step-content\"><strong>\u672c\u6587\u30b9\u30bf\u30a4\u30eb\u3067var()\u3092\u4f7f\u3063\u3066\u53c2\u7167\u3059\u308b<\/strong>\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u306e\u4e2d\u306b\u500b\u5225\u30b9\u30bf\u30a4\u30eb\u3092\u66f8\u304b\u306a\u304f\u3066\u3044\u3044<\/div><\/div>\n<div class=\"step-item\"><div class=\"step-num\">4<\/div><div class=\"step-content\"><strong>\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\u3092\u5fc5\u305a\u78ba\u8a8d\u3059\u308b<\/strong>\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u3067\u30824.5:1\u4ee5\u4e0a\u306e\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\u3092\u78ba\u4fdd\u3059\u308b<\/div><\/div>\n\n\n\n<div style=\"background:#f0fdf4;border:1px solid #22c55e;border-radius:8px;padding:20px 24px;margin:24px 0;\"><div style=\"display:flex;align-items:center;gap:8px;margin-bottom:12px;\"><span style=\"font-size:18px;\">&#128161;<\/span><strong style=\"color:#16a34a;font-size:15px;\">\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u306e\u753b\u50cf\u306f\u5225\u9014\u5bfe\u7b56\u304c\u5fc5\u8981<\/strong><\/div><p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">background-color\u306fCSS\u3067\u5bfe\u5fdc\u3067\u304d\u307e\u3059\u304c\u3001img\u30bf\u30b0\u3067\u57cb\u3081\u8fbc\u3093\u3060\u753b\u50cf\u306f\u305d\u306e\u307e\u307e\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u30ed\u30b4\u3084\u56f3\u89e3\u304c\u30e9\u30a4\u30c8\u30e2\u30fc\u30c9\u7528\u306e\u767d\u80cc\u666f\u524d\u63d0\u306e\u30c7\u30b6\u30a4\u30f3\u306e\u5834\u5408\u3001\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u3067\u898b\u3065\u3089\u304f\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002SVG\u753b\u50cf\u3067\u3042\u308c\u3070CSS\u3067fill\u3092\u5909\u66f4\u3067\u304d\u307e\u3059\u3002JPG\/PNG\u306f\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3067picture\u8981\u7d20\u3092\u5207\u308a\u66ff\u3048\u308b\u304b\u3001\u900f\u904ePNG\u3092\u4f7f\u3046\u306e\u304c\u4e00\u822c\u7684\u306a\u5bfe\u5fdc\u7b56\u3067\u3059\u3002<\/p><\/div>\n\n\n\n<div class=\"balloon-wrap\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/ceo-sugasawa.jpg\" alt=\"\u4ee3\u8868\u83c5\u6fa4\">\n    <span class=\"balloon-name\">\u4ee3\u8868\u83c5\u6fa4<\/span>\n  <\/div>\n  <div class=\"balloon-body\">\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u5bfe\u5fdc\u306fSEO\u306e\u8a55\u4fa1\u6307\u6a19\u300cCore Web Vitals\u300d\u3068\u306f\u76f4\u63a5\u95a2\u4fc2\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u30e6\u30fc\u30b6\u30fc\u4f53\u9a13\uff08UX\uff09\u306e\u5411\u4e0a\u306f\u9593\u63a5\u7684\u306b\u76f4\u5e30\u7387\u6539\u5584\u2192SEO\u5411\u4e0a\u306b\u3064\u306a\u304c\u308a\u307e\u3059\u3002\u3084\u3063\u3066\u640d\u306f\u306a\u3044\u5bfe\u5fdc\u3067\u3059\u3002<\/div>\n<\/div>\n\n\n\n<div class=\"balloon-wrap is-right\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/yamazaki-avatar.png\" alt=\"AI\u9b3c\u7ba1\u7406\u5c71\u5d0e\">\n    <span class=\"balloon-name\">AI\u9b3c\u7ba1\u7406\u5c71\u5d0e<\/span>\n  <\/div>\n  <div class=\"balloon-body\">CSS\u5909\u6570\u3092\u4f7f\u3063\u305f\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u5bfe\u5fdc\u306f\u3001\u6700\u521d\u306e\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u306b\u5c11\u3057\u624b\u9593\u304c\u304b\u304b\u308a\u307e\u3059\u3002\u3067\u3082\u4e00\u5ea6\u6574\u3048\u3066\u304a\u3051\u3070\u3001\u5f8c\u304b\u3089\u8272\u3092\u5909\u3048\u308b\u3068\u304d\u306b\u5909\u6570\u306e\u5024\u3092\u5909\u3048\u308b\u3060\u3051\u3067OK\u306a\u306e\u3067\u3001\u9577\u671f\u7684\u306b\u306f\u7ba1\u7406\u304c\u304b\u306a\u308a\u697d\u306b\u306a\u308a\u307e\u3059\u3002<\/div>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-css-background&#038;blog_slug=cc-css-background\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-css-background&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-09\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">09<\/span>\n  <span class=\"section-label\" style=\"display:block;\">BG VS BG-COLOR<\/span>\n  <span class=\"section-title\" style=\"display:block;\">background-color\u3068background\u306e\u9055\u3044<\/span>\n  <span class=\"section-desc\">\u6df7\u540c\u3057\u3084\u3059\u30442\u3064\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u6b63\u3057\u304f\u7406\u89e3\u3059\u308b<\/span>\n<\/h2>\n\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #6b7280;border-radius:0 8px 8px 0;padding:16px 20px;margin:20px 0;\"><p style=\"margin:0 0 4px;font-size:13px;font-weight:700;color:#6b7280;letter-spacing:1px;\">&#128218; \u7528\u8a9e\u89e3\u8aac<\/p><p style=\"margin:0;font-size:15px;line-height:1.7;\"><strong>background\u30b7\u30e7\u30fc\u30c8\u30cf\u30f3\u30c9\u30d7\u30ed\u30d1\u30c6\u30a3<\/strong>\uff1abackground-color\u30fbbackground-image\u30fbbackground-position\u30fbbackground-size\u30fbbackground-repeat\u30fbbackground-attachment\u30fbbackground-origin\u306a\u3069\u306ebackground\u95a2\u9023\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4e00\u62ec\u3067\u6307\u5b9a\u3067\u304d\u308b\u30b7\u30e7\u30fc\u30c8\u30cf\u30f3\u30c9\uff08\u7701\u7565\u5f62\uff09\u30d7\u30ed\u30d1\u30c6\u30a3\u3002background: #dc2626 url(image.jpg) no-repeat center\/cover \u306e\u3088\u3046\u306b\u66f8\u3051\u307e\u3059\u304c\u3001\u5358\u8272\u306e\u80cc\u666f\u8272\u3060\u3051\u3092\u8a2d\u5b9a\u3057\u305f\u3044\u5834\u5408\u306fbackground-color\u3092\u4f7f\u3046\u306e\u304c\u660e\u78ba\u3067\u5b89\u5168\u3067\u3059\u3002<\/p><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">CSS\u306b\u306f<strong>background-color<\/strong>\uff08\u80cc\u666f\u8272\u306e\u307f\uff09\u3068<strong>background<\/strong>\uff08\u80cc\u666f\u306b\u95a2\u3059\u308b\u3059\u3079\u3066\u306e\u8a2d\u5b9a\uff09\u3068\u3044\u3046\u4f3c\u305f2\u3064\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u3042\u308a\u307e\u3059\u3002\u6df7\u540c\u3057\u3084\u3059\u3044\u306e\u3067\u9055\u3044\u3092\u7406\u89e3\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<table>\n<thead><tr><th>\u6bd4\u8f03\u9805\u76ee<\/th><th>background-color<\/th><th>background\uff08\u30b7\u30e7\u30fc\u30c8\u30cf\u30f3\u30c9\uff09<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>\u8a2d\u5b9a\u3067\u304d\u308b\u3082\u306e<\/td><td>\u80cc\u666f\u8272\u306e\u307f<\/td><td>\u80cc\u666f\u8272\u30fb\u753b\u50cf\u30fb\u4f4d\u7f6e\u30fb\u30b5\u30a4\u30ba\u30fb\u7e70\u308a\u8fd4\u3057\u306a\u3069<\/td><\/tr>\n<tr><td>\u66f8\u304d\u65b9\u4f8b<\/td><td>background-color: #dc2626<\/td><td>background: #dc2626 url(img.jpg) no-repeat center\/cover<\/td><\/tr>\n<tr><td>\u4e0a\u66f8\u304d\u306e\u5f71\u97ff<\/td><td>\u8272\u3060\u3051\u3092\u4e0a\u66f8\u304d<\/td><td>\u4ed6\u306e\u80cc\u666f\u8a2d\u5b9a\u3082\u4e0a\u66f8\u304d\u3057\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u3042\u308b<\/td><\/tr>\n<tr><td>\u8aad\u307f\u3084\u3059\u3055<\/td><td>\u610f\u56f3\u304c\u660e\u78ba\u3067\u308f\u304b\u308a\u3084\u3059\u3044<\/td><td>\u8907\u6570\u8a2d\u5b9a\u3092\u307e\u3068\u3081\u3066\u66f8\u3051\u308b\u304c\u8907\u96d1\u306b\u306a\u308a\u3084\u3059\u3044<\/td><\/tr>\n<tr><td>\u63a8\u5968\u5834\u9762<\/td><td>\u80cc\u666f\u8272\u3060\u3051\u8a2d\u5b9a\u3059\u308b\u3068\u304d<\/td><td>\u80cc\u666f\u753b\u50cf\u3068\u8272\u3092\u540c\u6642\u306b\u8a2d\u5b9a\u3059\u308b\u3068\u304d<\/td><\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">background\u30b7\u30e7\u30fc\u30c8\u30cf\u30f3\u30c9\u3067\u80cc\u666f\u8272\u3092\u8a2d\u5b9a\u3057\u305f\u5834\u5408\u306e\u843d\u3068\u3057\u7a74\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* \u843d\u3068\u3057\u7a74\u306e\u4f8b *\/\n\n.card {\n  \/* \u80cc\u666f\u8272\u3068\u753b\u50cf\u3092\u4e21\u65b9\u8a2d\u5b9a *\/\n  background: #f8f9fa url(\"pattern.svg\") repeat;\n}\n\n.card.active {\n  \/* \u3053\u308c\u306fbackground-color\u3060\u3051\u3067\u306a\u304f\n     background-image\u3084background-repeat\u3082\n     \"\u306a\u3057\"\uff08\u521d\u671f\u5024\uff09\u306b\u30ea\u30bb\u30c3\u30c8\u3057\u3066\u3057\u307e\u3046\uff01 *\/\n  background: #dc2626;\n}\n\n\/* \u6b63\u3057\u3044\u66f8\u304d\u65b9 *\/\n.card.active {\n  background-color: #dc2626;  \/* \u8272\u3060\u3051\u3092\u4e0a\u66f8\u304d\u3002\u753b\u50cf\u8a2d\u5b9a\u306f\u7dad\u6301\u3055\u308c\u308b *\/\n}<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">background\u3092\u4e0a\u66f8\u304d\u3059\u308b\u3068\u3001\u524d\u306b\u8a2d\u5b9a\u3057\u305f\u80cc\u666f\u753b\u50cf\u3084\u7e70\u308a\u8fd4\u3057\u8a2d\u5b9a\u304c\u6d88\u3048\u3066\u3057\u307e\u3046\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<br><strong>\u80cc\u666f\u8272\u3060\u3051\u3092\u5909\u3048\u305f\u3044\u3068\u304d\u306fbackground-color\u3092\u4f7f\u3046<\/strong>\u306e\u304c\u5b89\u5168\u3067\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* background\u30b7\u30e7\u30fc\u30c8\u30cf\u30f3\u30c9\u306e\u66f8\u304d\u65b9\u4f8b *\/\n\n\/* \u80cc\u666f\u8272\u306e\u307f\uff08background-color\u3068\u540c\u3058\u52b9\u679c\uff09 *\/\n.simple { background: #f8f9fa; }\n\n\/* \u80cc\u666f\u753b\u50cf\u306e\u307f\uff08\u8272\u306f\u900f\u660e\u306e\u307e\u307e\uff09 *\/\n.with-image { background: url(\"hero.jpg\") no-repeat center\/cover; }\n\n\/* \u8272 + \u753b\u50cf\uff08\u8272\u306f\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\uff09 *\/\n.with-both {\n  background: #1a1a1a url(\"hero.jpg\") no-repeat center\/cover;\n  \/* \u753b\u50cf\u304c\u8aad\u3081\u306a\u3044\u5834\u5408\u306b#1a1a1a\u304c\u8868\u793a\u3055\u308c\u308b *\/\n}\n\n\/* \u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\uff08background-image\u3068\u3057\u3066\u52d5\u4f5c\uff09 *\/\n.gradient { background: linear-gradient(135deg, #dc2626, #991b1b); }\n\n\/* \u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3 + background-color \u306e\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af *\/\n.gradient-safe {\n  background-color: #dc2626;  \/* \u307e\u305acolor\u6307\u5b9a *\/\n  background-image: linear-gradient(135deg, #dc2626, #991b1b);  \/* \u5bfe\u5fdc\u30d6\u30e9\u30a6\u30b6\u306f\u3053\u3061\u3089\u304c\u9069\u7528 *\/\n}<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u822c\u7684\u306a\u30eb\u30fc\u30eb\u3068\u3057\u3066\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<div style=\"background:#fafafa;border-radius:8px;padding:16px 20px;margin:16px 0;border-left:4px solid #dc2626;\">\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>\u80cc\u666f\u8272\u3060\u3051\u3092\u8a2d\u5b9a\u30fb\u5909\u66f4\u3057\u305f\u3044 \u2192 background-color \u3092\u4f7f\u3046<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>\u80cc\u666f\u753b\u50cf\u3092\u8a2d\u5b9a\u3059\u308b \u2192 background-image \u307e\u305f\u306f background \u30b7\u30e7\u30fc\u30c8\u30cf\u30f3\u30c9\u3092\u4f7f\u3046<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>\u80cc\u666f\u8272 + \u80cc\u666f\u753b\u50cf\u3092\u540c\u6642\u306b\u8a2d\u5b9a\u3059\u308b \u2192 background \u30b7\u30e7\u30fc\u30c8\u30cf\u30f3\u30c9\u306b\u307e\u3068\u3081\u308b<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>\u65e2\u5b58\u306e\u80cc\u666f\u753b\u50cf\u3092\u7dad\u6301\u3057\u3064\u3064\u8272\u3060\u3051\u5909\u3048\u305f\u3044 \u2192 background-color \u3067\u4e0a\u66f8\u304d\u3059\u308b<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u3092\u8a2d\u5b9a\u3059\u308b \u2192 background \u307e\u305f\u306f background-image \u306b linear-gradient \u3092\u4f7f\u3046<\/span><\/div>\n<\/div>\n\n\n\n<div style=\"background:#fef2f2;border:2px solid #dc2626;border-radius:8px;padding:20px 24px;margin:24px 0;\"><div style=\"display:flex;align-items:center;gap:8px;margin-bottom:12px;\"><span style=\"font-size:20px;\">&#9888;&#65039;<\/span><strong style=\"color:#dc2626;font-size:16px;\">background\u30b7\u30e7\u30fc\u30c8\u30cf\u30f3\u30c9\u306f\u521d\u671f\u5024\u3078\u306e\u30ea\u30bb\u30c3\u30c8\u306b\u6ce8\u610f<\/strong><\/div><p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">background: #dc2626; \u3068\u66f8\u304f\u3068\u3001background-image\u306f\u521d\u671f\u5024\u306e\u300cnone\u300d\u306b\u3001background-repeat\u306f\u300crepeat\u300d\u306b\u3001background-position\u306f\u300c0% 0%\u300d\u306b\u30ea\u30bb\u30c3\u30c8\u3055\u308c\u307e\u3059\u3002\u524d\u306b\u8a2d\u5b9a\u3057\u3066\u3044\u305f\u80cc\u666f\u753b\u50cf\u306a\u3069\u306e\u8a2d\u5b9a\u304c\u6d88\u3048\u3066\u3057\u307e\u3046\u306e\u3067\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002\u610f\u56f3\u7684\u306b\u6d88\u3057\u305f\u3044\u306e\u3067\u306a\u3051\u308c\u3070 background-color: #dc2626; \u3068\u66f8\u304d\u307e\u3057\u3087\u3046\u3002<\/p><\/div>\n\n\n\n<div class=\"balloon-wrap\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/ceo-sugasawa.jpg\" alt=\"\u4ee3\u8868\u83c5\u6fa4\">\n    <span class=\"balloon-name\">\u4ee3\u8868\u83c5\u6fa4<\/span>\n  <\/div>\n  <div class=\"balloon-body\">background\u3068background-color\u306e\u9055\u3044\u306f\u3001\u5b9f\u969b\u306b\u4f7f\u3044\u306a\u304c\u3089\u899a\u3048\u3066\u3044\u304f\u306e\u304c\u4e00\u756a\u3067\u3059\u3002\u300c\u8272\u3060\u3051\u5909\u3048\u305f\u3044\u306e\u306b\u753b\u50cf\u304c\u6d88\u3048\u305f\u300d\u3068\u3044\u3046\u30c8\u30e9\u30d6\u30eb\u3067\u6c17\u3065\u304f\u3053\u3068\u304c\u591a\u3044\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u3059\u3002<\/div>\n<\/div>\n\n\n\n<div class=\"balloon-wrap is-right\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/yamazaki-avatar.png\" alt=\"AI\u9b3c\u7ba1\u7406\u5c71\u5d0e\">\n    <span class=\"balloon-name\">AI\u9b3c\u7ba1\u7406\u5c71\u5d0e<\/span>\n  <\/div>\n  <div class=\"balloon-body\">\u8ff7\u3063\u305f\u3089background-color\u3092\u4f7f\u3046\u3001\u3068\u3044\u3046\u30eb\u30fc\u30eb\u3067\u899a\u3048\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\u3002background\u306f\u4fbf\u5229\u3067\u3059\u304c\u3001\u610f\u56f3\u3057\u306a\u3044\u4e0a\u66f8\u304d\u304c\u8d77\u304d\u3084\u3059\u3044\u3067\u3059\u3002\u660e\u793a\u7684\u306bbackground-color\u3068\u66f8\u304f\u307b\u3046\u304c\u8aad\u3080\u4eba\u306b\u3082\u610f\u56f3\u304c\u4f1d\u308f\u308a\u3084\u3059\u3044\u3067\u3059\u3002<\/div>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-css-background&#038;blog_slug=cc-css-background\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-css-background&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-10\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">10<\/span>\n  <span class=\"section-label\" style=\"display:block;\">ACCESSIBILITY<\/span>\n  <span class=\"section-title\" style=\"display:block;\">\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\uff08\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\uff09<\/span>\n  <span class=\"section-desc\">\u3059\u3079\u3066\u306e\u4eba\u306b\u898b\u3084\u3059\u3044\u30c7\u30b6\u30a4\u30f3\u3092\u4f5c\u308b<\/span>\n<\/h2>\n\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #6b7280;border-radius:0 8px 8px 0;padding:16px 20px;margin:20px 0;\"><p style=\"margin:0 0 4px;font-size:13px;font-weight:700;color:#6b7280;letter-spacing:1px;\">&#128218; \u7528\u8a9e\u89e3\u8aac<\/p><p style=\"margin:0;font-size:15px;line-height:1.7;\"><strong>\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\uff08Contrast Ratio\uff09<\/strong>\uff1a\u30c6\u30ad\u30b9\u30c8\u8272\u3068\u80cc\u666f\u8272\u306e\u8f1d\u5ea6\uff08\u660e\u308b\u3055\uff09\u306e\u6bd4\u7387\u3002\u6570\u5024\u304c\u5927\u304d\u3044\u307b\u3069\u898b\u3084\u3059\u3044\u3002WCAG\uff08Web\u30b3\u30f3\u30c6\u30f3\u30c4\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\uff09\u3067\u306f\u901a\u5e38\u30c6\u30ad\u30b9\u30c8\uff0818px\u672a\u6e80\uff09\u306b4.5:1\u4ee5\u4e0a\u3092\u63a8\u5968\uff08AA\u57fa\u6e96\uff09\u3002\u5927\u304d\u3044\u30c6\u30ad\u30b9\u30c8\uff0818px\u4ee5\u4e0a\u307e\u305f\u306f14px\u592a\u5b57\uff09\u306f3:1\u4ee5\u4e0a\u3067OK\u3002\u9ad8\u9f62\u8005\u30fb\u8996\u529b\u304c\u5f31\u3044\u65b9\u30fb\u8272\u899a\u591a\u69d8\u6027\u304c\u3042\u308b\u65b9\u3078\u306e\u914d\u616e\u3068\u3057\u3066\u91cd\u8981\u3067\u3059\u3002<\/p><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Web\u30b5\u30a4\u30c8\u306ebackground-color\u3092\u8a2d\u5b9a\u3059\u308b\u3068\u304d\u3001\u898b\u843d\u3068\u3057\u304c\u3061\u306a\u91cd\u8981\u306a\u8981\u7d20\u304c<strong>\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4<\/strong>\u3067\u3059\u3002<br>\u304a\u3057\u3083\u308c\u3067\u8584\u3044\u30b0\u30ec\u30fc\u306e\u30c6\u30ad\u30b9\u30c8\u3092\u30b0\u30ec\u30fc\u304c\u304b\u3063\u305f\u80cc\u666f\u306b\u914d\u7f6e\u3059\u308b\u2014\u2014\u3088\u304f\u898b\u308b\u30c7\u30b6\u30a4\u30f3\u3067\u3059\u304c\u3001\u9ad8\u9f62\u8005\u3084\u8996\u529b\u306e\u5f31\u3044\u65b9\u306b\u306f\u8aad\u307f\u306b\u304f\u3044\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\u306f<strong>\u30c6\u30ad\u30b9\u30c8\u8272\u3068\u80cc\u666f\u8272\u306e\u8f1d\u5ea6\u306e\u6bd4\u7387<\/strong>\u3067\u8a08\u7b97\u3055\u308c\u307e\u3059\u3002<br>\u305f\u3068\u3048\u3070\u767d\u80cc\u666f\uff08#ffffff\uff09\u306b\u9ed2\u6587\u5b57\uff08#000000\uff09\u306f21:1\u3068\u3044\u3046\u6700\u9ad8\u306e\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\u3067\u3059\u3002<br>\u9006\u306b\u767d\u80cc\u666f\u306b\u8584\u3044\u30b0\u30ec\u30fc\u6587\u5b57\u306f2:1\u30843:1\u306b\u306a\u308a\u3001WCAG\u306e\u57fa\u6e96\u3092\u4e0b\u56de\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* \u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u4e0d\u8db3\u306e\u4f8b\uff08NG\uff09 *\/\n.low-contrast {\n  background-color: #f5f5f5;  \/* \u8584\u3044\u30b0\u30ec\u30fc\u80cc\u666f *\/\n  color: #c0c0c0;              \/* \u8584\u3044\u30b0\u30ec\u30fc\u6587\u5b57 *\/\n  \/* \u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4: \u7d041.6:1 \u2014 \u975e\u5e38\u306b\u4f4e\u3044 *\/\n}\n\n\/* \u3088\u304f\u898b\u308bNG\u4f8b *\/\n.muted-bad {\n  background-color: #ffffff;  \/* \u767d\u80cc\u666f *\/\n  color: #bbbbbb;              \/* \u8584\u3044\u30b0\u30ec\u30fc\u6587\u5b57 *\/\n  \/* \u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4: \u7d042.5:1 \u2014 WCAA\u3092\u5927\u304d\u304f\u4e0b\u56de\u308b *\/\n}\n\n\/* \u5341\u5206\u306a\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u306e\u4f8b\uff08OK\uff09 *\/\n.good-contrast {\n  background-color: #ffffff;  \/* \u767d\u80cc\u666f *\/\n  color: #595959;              \/* \u30c0\u30fc\u30af\u30b0\u30ec\u30fc\u6587\u5b57 *\/\n  \/* \u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4: 7.0:1 \u2014 WCAG AAA\u9069\u5408 *\/\n}\n\n\/* \u672c\u6587\u30c6\u30ad\u30b9\u30c8\u306e\u5b9a\u756a *\/\nbody {\n  background-color: #ffffff;\n  color: #1f2937;  \/* \u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4: \u7d0416:1 \u2014 \u975e\u5e38\u306b\u9ad8\u3044 *\/\n}<\/pre><\/div>\n\n\n\n<table>\n<thead><tr><th>WCAG\u57fa\u6e96<\/th><th>\u30c6\u30ad\u30b9\u30c8\u30b5\u30a4\u30ba<\/th><th>\u5fc5\u8981\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4<\/th><th>\u9069\u5408\u30ec\u30d9\u30eb<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>AA\uff08\u63a8\u5968\u6700\u4f4e\u57fa\u6e96\uff09<\/td><td>\u901a\u5e38\u30c6\u30ad\u30b9\u30c8\uff0818px\u672a\u6e80\uff09<\/td><td>4.5:1\u4ee5\u4e0a<\/td><td>AA\u9069\u5408<\/td><\/tr>\n<tr><td>AA<\/td><td>\u5927\u304d\u3044\u30c6\u30ad\u30b9\u30c8\uff0818px\u4ee5\u4e0a\uff09<\/td><td>3:1\u4ee5\u4e0a<\/td><td>AA\u9069\u5408<\/td><\/tr>\n<tr><td>AA<\/td><td>14px\u4ee5\u4e0a\u306e\u592a\u5b57\u30c6\u30ad\u30b9\u30c8<\/td><td>3:1\u4ee5\u4e0a<\/td><td>AA\u9069\u5408<\/td><\/tr>\n<tr><td>AAA\uff08\u6700\u9ad8\u57fa\u6e96\uff09<\/td><td>\u901a\u5e38\u30c6\u30ad\u30b9\u30c8<\/td><td>7:1\u4ee5\u4e0a<\/td><td>AAA\u9069\u5408<\/td><\/tr>\n<tr><td>AAA<\/td><td>\u5927\u304d\u3044\u30c6\u30ad\u30b9\u30c8<\/td><td>4.5:1\u4ee5\u4e0a<\/td><td>AAA\u9069\u5408<\/td><\/tr>\n<tr><td>\u975e\u9069\u5408<\/td><td>\u5168\u30b5\u30a4\u30ba<\/td><td>4.5:1\u672a\u6e80\uff08\u901a\u5e38\uff09<\/td><td>\u6539\u5584\u304c\u5fc5\u8981<\/td><\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">\u80cc\u666f\u8272\u3068\u6587\u5b57\u8272\u306e\u7d44\u307f\u5408\u308f\u305b\u3092\u9078\u3076\u3068\u304d\u306f\u3001\u4e8b\u524d\u306b\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\u3092\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<br>\u7121\u6599\u306e\u30aa\u30f3\u30e9\u30a4\u30f3\u30c4\u30fc\u30eb\u3067\u7c21\u5358\u306b\u30c1\u30a7\u30c3\u30af\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#fafafa;border-radius:8px;padding:16px 20px;margin:16px 0;border-left:4px solid #dc2626;\">\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>WebAIM Contrast Checker\uff08https:\/\/webaim.org\/resources\/contrastchecker\/\uff09\u306bHEX\u5024\u3092\u5165\u308c\u3066\u30c1\u30a7\u30c3\u30af<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>Figma\u306e\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u30d7\u30e9\u30b0\u30a4\u30f3\u3067WCAA\u9069\u5408\u3092\u78ba\u8a8d<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>Chrome DevTools\u306e\u300c\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u300d\u30bf\u30d6\u3067\u30da\u30fc\u30b8\u5168\u4f53\u3092\u30b9\u30ad\u30e3\u30f3<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>Lighthouse\uff08Chrome\u62e1\u5f35\uff09\u3067\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u30b9\u30b3\u30a2\u3092\u8a08\u6e2c<\/span><\/div>\n<\/div>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\">\/* \u767d\u80cc\u666f\u3067\u306e\u6587\u5b57\u8272\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\u306e\u76ee\u5b89 *\/\n\n\/* \u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\u304c\u9ad8\u3044\uff08\u826f\u3044\uff09\u9806 *\/\n.text-black  { color: #000000; }  \/* 21:1 \u2014 \u6700\u9ad8 *\/\n.text-900    { color: #1a1a1a; }  \/* \u7d0418:1 \u2014 \u975e\u5e38\u306b\u9ad8\u3044 *\/\n.text-800    { color: #333333; }  \/* \u7d0412.6:1 \u2014 WCAG AAA\u9069\u5408 *\/\n.text-700    { color: #595959; }  \/* \u7d047:1 \u2014 WCAG AAA\u9069\u5408 *\/\n\n\/* \u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\u304cAA\u57fa\u6e96\u30ae\u30ea\u30ae\u30ea *\/\n.text-600    { color: #767676; }  \/* 4.54:1 \u2014 WCAG AA\u9069\u5408\uff08\u30ae\u30ea\u30ae\u30ea\uff09 *\/\n\n\/* \u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\u304cAA\u57fa\u6e96\u672a\u6e80\uff08NG\uff09 *\/\n.text-500    { color: #909090; }  \/* 3.5:1 \u2014 AA\u4e0d\u9069\u5408 *\/\n.text-400    { color: #aaaaaa; }  \/* 2.3:1 \u2014 AA\u4e0d\u9069\u5408 *\/\n.text-300    { color: #cccccc; }  \/* 1.6:1 \u2014 \u975e\u5e38\u306b\u4f4e\u3044 *\/\n\n\/* \u767d\u80cc\u666f\u3067\u4f7f\u3046\u300c\u88dc\u8db3\u30c6\u30ad\u30b9\u30c8\u300d\u306e\u5b89\u5168\u306a\u4e0b\u9650 *\/\n.text-muted-safe { color: #6b7280; }  \/* 4.6:1 \u2014 AA\u9069\u5408 *\/\n\/* NG\uff1a\u3088\u304f\u3084\u308a\u304c\u3061\u306a\u30df\u30b9 *\/\n.text-muted-bad  { color: #9ca3af; }  \/* 2.9:1 \u2014 AA\u4e0d\u9069\u5408 *\/<\/pre><\/div>\n\n\n\n<div style=\"background:#fef2f2;border:2px solid #dc2626;border-radius:8px;padding:20px 24px;margin:24px 0;\"><div style=\"display:flex;align-items:center;gap:8px;margin-bottom:12px;\"><span style=\"font-size:20px;\">&#9888;&#65039;<\/span><strong style=\"color:#dc2626;font-size:16px;\">\u300c\u304a\u3057\u3083\u308c\u300d\u3068\u300c\u8aad\u307f\u3084\u3059\u3055\u300d\u306f\u4e21\u7acb\u3067\u304d\u308b<\/strong><\/div><p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">\u8584\u3044\u30b0\u30ec\u30fc\u306e\u30c6\u30ad\u30b9\u30c8\u306f\u304a\u3057\u3083\u308c\u306b\u898b\u3048\u307e\u3059\u304c\u3001\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u306e\u89b3\u70b9\u3067\u306f\u554f\u984c\u304c\u3042\u308a\u307e\u3059\u3002#6b7280\uff08\u30b0\u30ec\u30fc\uff09\u3068#ffffff\uff08\u767d\u80cc\u666f\uff09\u306e\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\u306f4.6:1\u3067\u30ae\u30ea\u30ae\u30eaAA\u9069\u5408\u3067\u3059\u3002\u3053\u308c\u3088\u308a\u8584\u3044\u8272\u306f\u30c7\u30b6\u30a4\u30f3\u4e0a\u300c\u8aad\u3081\u3066\u3044\u308b\u3088\u3046\u306b\u898b\u3048\u3066\u3082\u300d\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u57fa\u6e96\u3092\u4e0b\u56de\u308a\u307e\u3059\u3002#6b7280\u3092\u88dc\u8db3\u30c6\u30ad\u30b9\u30c8\u306e\u6700\u8584\u30e9\u30a4\u30f3\u3068\u3057\u3066\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p><\/div>\n\n\n\n<div style=\"background:#f0fdf4;border:1px solid #22c55e;border-radius:8px;padding:20px 24px;margin:24px 0;\"><div style=\"display:flex;align-items:center;gap:8px;margin-bottom:12px;\"><span style=\"font-size:18px;\">&#128161;<\/span><strong style=\"color:#16a34a;font-size:15px;\">\u30ab\u30e9\u30fc\u30c9\u30bb\u30af\u30b7\u30e7\u30f3\u306e\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\u3082\u78ba\u8a8d\u3059\u308b<\/strong><\/div><p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">\u8d64\uff08#dc2626\uff09\u3084\u9752\uff08#2563eb\uff09\u306a\u3069\u6fc3\u3044\u30d6\u30e9\u30f3\u30c9\u30ab\u30e9\u30fc\u306e\u80cc\u666f\u306b\u767d\u3044\u30c6\u30ad\u30b9\u30c8\u3092\u7f6e\u304f\u5834\u5408\u3082\u3001\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\u3092\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002#dc2626\u80cc\u666f + \u767d\u6587\u5b57\u306f\u7d045.1:1\u3067AA\u9069\u5408\u3067\u3059\u304c\u3001\u8584\u3044\u30d6\u30e9\u30f3\u30c9\u30ab\u30e9\u30fc\uff08#fca5a5\u306a\u3069\uff09\u306e\u80cc\u666f\u306b\u306f\u767d\u6587\u5b57\u3067\u306f\u4e0d\u9069\u5408\u306b\u306a\u308a\u307e\u3059\u3002<\/p><\/div>\n\n\n\n<div class=\"balloon-wrap\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/ceo-sugasawa.jpg\" alt=\"\u4ee3\u8868\u83c5\u6fa4\">\n    <span class=\"balloon-name\">\u4ee3\u8868\u83c5\u6fa4<\/span>\n  <\/div>\n  <div class=\"balloon-body\">\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u5bfe\u5fdc\u306fSEO\u306b\u3082\u95a2\u4fc2\u3057\u307e\u3059\u3002Google\u306f\u30da\u30fc\u30b8\u306e\u4f7f\u3044\u3084\u3059\u3055\u3092\u8a55\u4fa1\u57fa\u6e96\u306e\u4e00\u3064\u306b\u3057\u3066\u304a\u308a\u3001\u8aad\u307f\u3084\u3059\u3044\u914d\u8272\u306f\u30e6\u30fc\u30b6\u30fc\u6ede\u5728\u6642\u9593\u306e\u5411\u4e0a\u306b\u3082\u3064\u306a\u304c\u308a\u307e\u3059\u3002<\/div>\n<\/div>\n\n\n\n<div class=\"balloon-wrap is-right\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/yamazaki-avatar.png\" alt=\"AI\u9b3c\u7ba1\u7406\u5c71\u5d0e\">\n    <span class=\"balloon-name\">AI\u9b3c\u7ba1\u7406\u5c71\u5d0e<\/span>\n  <\/div>\n  <div class=\"balloon-body\">\u88dc\u8db3\u30c6\u30ad\u30b9\u30c8\u3092\u8584\u304f\u3057\u3059\u304e\u3066\u3057\u307e\u3046\u306e\u306f\u975e\u5e38\u306b\u3088\u304f\u3042\u308b\u30df\u30b9\u3067\u3059\u3002#9ca3af\u306a\u3069\u306e\u8584\u3044\u30b0\u30ec\u30fc\u306f\u767d\u80cc\u666f\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u3067WCAG\u3092\u4e0b\u56de\u308a\u307e\u3059\u3002#6b7280\u3092\u300c\u88dc\u8db3\u30c6\u30ad\u30b9\u30c8\u306e\u6700\u8584\u30e9\u30a4\u30f3\u300d\u3068\u3057\u3066\u4f7f\u3063\u3066\u304f\u3060\u3055\u3044\u3002<\/div>\n<\/div>\n\n\n<div style=\"margin:48px 0 8px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;\"><a href=\"https:\/\/aikanri.genai-ai.co.jp\/seminar2-blog\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_content=cc-css-background&#038;blog_slug=cc-css-background\" target=\"_blank\" rel=\"noopener\" aria-label=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff08\u7121\u6599\u30fb1on1\u30fb60\u5206\uff09\u306e\u4e88\u7d04\u753b\u9762\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_seminar_claude_code_2026.jpg\" alt=\"Claude Code \u5b8c\u5168\u89e3\u8aac\u30bb\u30df\u30ca\u30fc\uff5c\u7d4c\u55b6\u8005\u30fb\u4f1a\u793e\u5f79\u54e1\u5c02\u7528 1on1 60\u5206 \u7121\u6599\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&#038;utm_medium=h2banner&#038;utm_campaign=cc-css-background&#038;utm_content=h2-banner-kanri\" target=\"_blank\" rel=\"noopener\" aria-label=\"AI\u9b3c\u7ba1\u7406 \u516c\u5f0f\u30b5\u30a4\u30c8\u3078\" style=\"flex:1 1 280px;max-width:360px;text-decoration:none;\"><img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/05\/cta_blog_1to1.jpg\" alt=\"Claude Code\u3092\u7d4c\u55b6\u306b\u6d3b\u304b\u3057\u305f\u3044\u65b9\u3078 \u2014 AI\u9b3c\u7ba1\u7406\" style=\"width:100%;height:auto;border-radius:8px;display:block;\"><\/a><\/div>\n\n\n<div id=\"sec-11\"><\/div>\n<h2 class=\"section-header-img\" style=\"margin:32px 0 24px;border-radius:8px;overflow:hidden;background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);padding:32px 28px;color:#fff;position:relative;border:none;border-left:none;text-align:left;\">\n  <span class=\"section-number\" style=\"display:block;\">11<\/span>\n  <span class=\"section-label\" style=\"display:block;\">AI AUTOMATION<\/span>\n  <span class=\"section-title\" style=\"display:block;\">Claude Code\u3067\u30c6\u30fc\u30de\u30ab\u30e9\u30fc\u3092\u4e00\u62ec\u5909\u66f4<\/span>\n  <span class=\"section-desc\">AI\u306b\u6307\u793a\u3059\u308b\u3060\u3051\u3067CSS\u3092\u4e38\u3054\u3068\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0<\/span>\n<\/h2>\n\n\n\n<div style=\"background:#f8f9fa;border-left:4px solid #6b7280;border-radius:0 8px 8px 0;padding:16px 20px;margin:20px 0;\"><p style=\"margin:0 0 4px;font-size:13px;font-weight:700;color:#6b7280;letter-spacing:1px;\">&#128218; \u7528\u8a9e\u89e3\u8aac<\/p><p style=\"margin:0;font-size:15px;line-height:1.7;\"><strong>Claude Code\uff08\u30af\u30ed\u30fc\u30c9\u30b3\u30fc\u30c9\uff09<\/strong>\uff1aAnthropic\u304c\u63d0\u4f9b\u3059\u308bAI\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u30a2\u30b7\u30b9\u30bf\u30f3\u30c8\u3002\u30c1\u30e3\u30c3\u30c8\u5f62\u5f0f\u3067CSS\u306e\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u30fb\u30ab\u30e9\u30fc\u30d1\u30ec\u30c3\u30c8\u8a2d\u8a08\u30fb\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u5bfe\u5fdc\u30fb\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u30c1\u30a7\u30c3\u30af\u3092AI\u306b\u4f9d\u983c\u3067\u304d\u307e\u3059\u3002\u300c\u3053\u306eCSS\u306ebackground-color\u3092\u5168\u90e8CSS\u5909\u6570\u306b\u7f6e\u304d\u63db\u3048\u3066\u300d\u306e\u3088\u3046\u306a\u65e5\u672c\u8a9e\u306e\u6307\u793a\u3060\u3051\u3067\u3001\u6570\u767e\u884c\u306eCSS\u3092\u81ea\u52d5\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u3057\u307e\u3059\u3002\u975e\u30a8\u30f3\u30b8\u30cb\u30a2\u3067\u3082\u4f7f\u3048\u308b\u30ec\u30d9\u30eb\u306e\u30b7\u30f3\u30d7\u30eb\u306a\u6307\u793a\u3067\u3001\u30d7\u30ed\u30ec\u30d9\u30eb\u306eCSS\u6539\u5584\u304c\u5b9f\u73fe\u3057\u307e\u3059\u3002<\/p><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">background-color\u3092\u4f7f\u3044\u3053\u306a\u3059\u305f\u3081\u306e\u77e5\u8b58\u306f\u3072\u3068\u3068\u304a\u308a\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<br>\u305f\u3060\u300c\u65e2\u5b58\u306e\u30b5\u30a4\u30c8\u306e\u30c6\u30fc\u30de\u30ab\u30e9\u30fc\u3092\u5909\u3048\u305f\u3044\u300d\u300cCSS\u5909\u6570\u3092\u4f7f\u3063\u3066\u6574\u7406\u3057\u305f\u3044\u300d<br>\u300c\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u5bfe\u5fdc\u3092\u8ffd\u52a0\u3057\u305f\u3044\u300d\u2014\u2014\u305d\u3093\u306a\u4f5c\u696d\u3092<strong>\u5168\u90e8AI\u306b\u4efb\u305b\u308b<\/strong>\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u305d\u308c\u304c<strong>Claude Code\uff08\u30af\u30ed\u30fc\u30c9\u30b3\u30fc\u30c9\uff09<\/strong>\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u305f\u3068\u3048\u3070\u3001\u30b5\u30a4\u30c8\u5168\u4f53\u306ebackground-color\u304c#dc2626\uff08\u8d64\uff09\u3067\u7d71\u4e00\u3055\u308c\u3066\u3044\u305f\u3082\u306e\u3092#2563eb\uff08\u9752\uff09\u306b\u5909\u3048\u305f\u3044\u5834\u5408\u3092\u8003\u3048\u3066\u307f\u307e\u3057\u3087\u3046\u3002<br>\u624b\u52d5\u3067\u306fCSS\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u3044\u3066\u3059\u3079\u3066\u306e#dc2626\u3092\u63a2\u3057\u3066\u7f6e\u63db\u3059\u308b\u4f5c\u696d\u304c\u5fc5\u8981\u3067\u3059\u304c\u3001Claude Code\u306a\u3089\u4e00\u884c\u306e\u6307\u793a\u3067\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\"># Claude Code\u3078\u306e\u6307\u793a\u4f8b\uff08\u30d7\u30ed\u30f3\u30d7\u30c8\uff09\n\n\"\"\"\n\u4ee5\u4e0b\u306eCSS\u30d5\u30a1\u30a4\u30eb\u306e\u30c6\u30fc\u30de\u30ab\u30e9\u30fc\u3092\u5909\u66f4\u3057\u3066\u304f\u3060\u3055\u3044\u3002\n\n\u73fe\u5728: #dc2626\uff08\u8d64\u7cfb\uff09\n\u5909\u66f4\u5f8c: #2563eb\uff08\u9752\u7cfb\uff09\n\n\u30fbbackground-color\u306b\u4f7f\u308f\u308c\u3066\u3044\u308b\u30c6\u30fc\u30de\u30ab\u30e9\u30fc\u3092\u3059\u3079\u3066\u5909\u66f4\n\u30fb\u30db\u30d0\u30fc\u8272\uff08\u3088\u308a\u6fc3\u3044\u8272\uff09\u3082\u81ea\u52d5\u3067\u8abf\u6574\n\u30fbCSS\u5909\u6570\uff08--bg-brand \u306a\u3069\uff09\u304c\u3042\u308c\u3070\u305d\u3061\u3089\u3082\u66f4\u65b0\n\u30fb\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\u304cWCAG AA\u57fa\u6e96\uff084.5:1\uff09\u3092\u4e0b\u56de\u308b\u5834\u5408\u306f\u8b66\u544a\u3092\u51fa\u3057\u3066\n\n\u5bfe\u8c61\u30d5\u30a1\u30a4\u30eb: style.css\n\"\"\"<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Claude Code\u306f\u4e0a\u306e\u3088\u3046\u306a\u6307\u793a\u3092\u53d7\u3051\u53d6\u308b\u3068\u3001CSS\u30d5\u30a1\u30a4\u30eb\u3092\u5206\u6790\u3057\u3066\u81ea\u52d5\u3067\u30c6\u30fc\u30de\u30ab\u30e9\u30fc\u3092\u5909\u66f4\u3057\u307e\u3059\u3002<br>\u3055\u3089\u306b\u300c\u30db\u30d0\u30fc\u8272\u304c\u660e\u308b\u3059\u304e\u3066\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\u304c\u8db3\u308a\u306a\u3044\u300d\u306a\u3069\u306e\u554f\u984c\u3082\u81ea\u52d5\u3067\u691c\u51fa\u30fb\u4fee\u6b63\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3082\u3063\u3068\u5927\u898f\u6a21\u306a\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\"># CSS\u5909\u6570\u3078\u306e\u4e00\u62ec\u79fb\u884c\u6307\u793a\n\n\"\"\"\n\u3053\u306eCSS\u30d5\u30a1\u30a4\u30eb\u306ebackground-color\u3092\u5168\u90e8CSS\u5909\u6570\u306b\u79fb\u884c\u3057\u3066\u304f\u3060\u3055\u3044\u3002\n\n\u624b\u9806\uff1a\n1. \u30e6\u30cb\u30fc\u30af\u306a\u80cc\u666f\u8272\u306e\u5024\u3092\u4e00\u89a7\u5316\u3059\u308b\n2. \u610f\u5473\u306e\u3042\u308b\u5909\u6570\u540d\u3092\u3064\u3051\u308b\uff08\u4f8b: --bg-primary, --bg-card, --bg-hero\u7b49\uff09\n3. :root\u306b\u5909\u6570\u3092\u5b9a\u7fa9\u3059\u308b\n4. \u65e2\u5b58\u306ebackground-color\u306e\u5024\u3092\u5909\u6570\u53c2\u7167\uff08var()\uff09\u306b\u7f6e\u304d\u63db\u3048\u308b\n5. \u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u5bfe\u5fdc\u306e@media (prefers-color-scheme: dark)\u3082\u8ffd\u52a0\u3059\u308b\n\n\u30d5\u30a1\u30a4\u30eb: style.css\uff08300\u884c\uff09\n\"\"\"<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u3088\u3046\u306a\u6307\u793a\u3092\u51fa\u3059\u3068\u3001Claude Code\u306f300\u884c\u306eCSS\u3092\u5206\u6790\u3057\u3066\u5909\u6570\u5316\u3057\u3001\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u5bfe\u5fdc\u3092\u8ffd\u52a0\u3057\u305f\u30b3\u30fc\u30c9\u3092\u751f\u6210\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"g-flow-row\" style=\"margin:24px 0;\">\n  <div class=\"g-flow-item\">CSS\u30d5\u30a1\u30a4\u30eb\u3092<br>Claude Code\u306b\u6e21\u3059<\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">\u65e5\u672c\u8a9e\u3067\u6307\u793a\u3092\u51fa\u3059<br>\uff08\u30c6\u30fc\u30de\u5909\u66f4\u30fb\u5909\u6570\u5316\u7b49\uff09<\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">AI\u304cCSS\u3092\u5206\u6790<br>\u30fb\u81ea\u52d5\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0<\/div>\n  <div class=\"g-flow-arrow\">&#8594;<\/div>\n  <div class=\"g-flow-item\">\u4fee\u6b63\u6e08\u307fCSS\u3092\u53d7\u3051\u53d6\u308b<br>\u30fb\u30b3\u30d4\u30fc\u3057\u3066\u4f7f\u3046<\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Claude Code\u306b\u4f9d\u983c\u3067\u304d\u308bbackground-color\u95a2\u9023\u306e\u30bf\u30b9\u30af\u3092\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<div style=\"background:#fafafa;border-radius:8px;padding:16px 20px;margin:16px 0;border-left:4px solid #dc2626;\">\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>\u300c\u3053\u306e\u30b5\u30a4\u30c8\u306e\u30c6\u30fc\u30de\u30ab\u30e9\u30fc\u3092\u8d64\u304b\u3089\u9752\u306b\u5909\u3048\u3066\u300d\uff08\u4e00\u62ec\u7f6e\u63db\uff09<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>\u300cbackground-color\u3092CSS\u5909\u6570\u306b\u79fb\u884c\u3057\u3066\u300d\uff08\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\uff09<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>\u300c\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u5bfe\u5fdc\u306eCSS\u3092\u8ffd\u52a0\u3057\u3066\u300d\uff08\u6a5f\u80fd\u8ffd\u52a0\uff09<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>\u300c\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\u304cWCAG AA\u57fa\u6e96\u3092\u4e0b\u56de\u3063\u3066\u3044\u308b\u7b87\u6240\u3092\u4fee\u6b63\u3057\u3066\u300d\uff08\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u6539\u5584\uff09<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>\u300c\u3053\u306e\u30c7\u30b6\u30a4\u30f3\u4ed5\u69d8\u66f8\u306e\u914d\u8272\u3092\u305d\u306e\u307e\u307eCSS\u5909\u6570\u30bb\u30c3\u30c8\u306b\u3057\u3066\u300d\uff08\u8a2d\u8a08\uff09<\/span><\/div>\n<div style=\"display:flex;align-items:flex-start;gap:8px;padding:6px 0;font-size:15px;line-height:1.6;\"><span style=\"color:#dc2626;font-size:16px;flex-shrink:0;margin-top:2px;\">&#10004;&#65039;<\/span><span>\u300c\u30d6\u30e9\u30f3\u30c9\u30ab\u30e9\u30fc#dc2626\u3092\u8ef8\u306b\u3001\u30e9\u30a4\u30c8\u30fb\u30c0\u30fc\u30af\u4e21\u5bfe\u5fdc\u306e\u30ab\u30e9\u30fc\u30d1\u30ec\u30c3\u30c8\u3092\u4f5c\u3063\u3066\u300d\uff08\u65b0\u898f\u4f5c\u6210\uff09<\/span><\/div>\n<\/div>\n\n\n\n<div style=\"background:#1e1e1e;border-radius:8px;padding:20px 24px;margin:20px 0;overflow-x:auto;\"><pre style=\"margin:0;color:#d4d4d4;font-family:'Courier New',Courier,monospace;font-size:14px;line-height:1.7;white-space:pre;\"># Claude Code\u304c\u751f\u6210\u3059\u308b\u30ab\u30e9\u30fc\u30d1\u30ec\u30c3\u30c8\u306e\u4f8b\n\n:root {\n  \/* ========== Light Mode ========== *\/\n\n  \/* Brand Colors *\/\n  --bg-brand: #dc2626;           \/* \u30e1\u30a4\u30f3\u30d6\u30e9\u30f3\u30c9\u30ab\u30e9\u30fc *\/\n  --bg-brand-hover: #b91c1c;     \/* \u30db\u30d0\u30fc\u6642\uff08\u3088\u308a\u6fc3\u3044\uff09 *\/\n  --bg-brand-light: #fef2f2;     \/* \u8584\u3044\u8d64\uff08\u30a2\u30e9\u30fc\u30c8\u30dc\u30c3\u30af\u30b9\u7b49\uff09 *\/\n  --bg-brand-subtle: rgba(220, 38, 38, 0.08);  \/* \u975e\u5e38\u306b\u8584\u3044\u8d64 *\/\n\n  \/* Page Backgrounds *\/\n  --bg-page: #ffffff;            \/* \u30da\u30fc\u30b8\u80cc\u666f *\/\n  --bg-card: #ffffff;            \/* \u30ab\u30fc\u30c9\u80cc\u666f *\/\n  --bg-subtle: #f9fafb;          \/* \u30b5\u30d6\u30bb\u30af\u30b7\u30e7\u30f3\u80cc\u666f *\/\n  --bg-header: #1a1a1a;          \/* \u30d8\u30c3\u30c0\u30fc\u80cc\u666f *\/\n  --bg-footer: #111827;          \/* \u30d5\u30c3\u30bf\u30fc\u80cc\u666f *\/\n\n  \/* Semantic Colors *\/\n  --bg-success: rgba(22, 163, 74, 0.08);\n  --bg-warning: rgba(217, 119, 6, 0.08);\n  --bg-error:   rgba(220, 38, 38, 0.08);\n  --bg-info:    rgba(37, 99, 235, 0.08);\n\n  \/* Text Colors *\/\n  --text-primary:   #1f2937;\n  --text-secondary: #6b7280;  \/* \u6700\u8584\u30e9\u30a4\u30f3\uff08WCAG AA\u9069\u5408\uff09 *\/\n  --text-muted:     #9ca3af;  \/* \u88c5\u98fe\u7528\u306e\u307f\uff08\u672c\u6587\u306b\u306f\u4f7f\u308f\u306a\u3044\uff09 *\/\n\n  \/* Border *\/\n  --border: #e5e7eb;\n}\n\n@media (prefers-color-scheme: dark) {\n  :root {\n    --bg-brand: #f87171;\n    --bg-brand-hover: #fca5a5;\n    --bg-brand-light: #450a0a;\n    --bg-brand-subtle: rgba(248, 113, 113, 0.12);\n\n    --bg-page: #111827;\n    --bg-card: #1f2937;\n    --bg-subtle: #0f172a;\n    --bg-header: #0f172a;\n    --bg-footer: #030712;\n\n    --bg-success: rgba(74, 222, 128, 0.12);\n    --bg-warning: rgba(251, 191, 36, 0.12);\n    --bg-error:   rgba(248, 113, 113, 0.12);\n    --bg-info:    rgba(96, 165, 250, 0.12);\n\n    --text-primary:   #f3f4f6;\n    --text-secondary: #9ca3af;\n    --text-muted:     #6b7280;\n\n    --border: #374151;\n  }\n}<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u3088\u3046\u306a\u30ab\u30e9\u30fc\u30d1\u30ec\u30c3\u30c8\u3092\u4e00\u304b\u3089\u624b\u66f8\u304d\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u76f8\u5f53\u306a\u6642\u9593\u304c\u304b\u304b\u308a\u307e\u3059\u304c\u3001<br>Claude Code\u3078\u306e\u6307\u793a\u306a\u3089<strong>\u6570\u5341\u79d2\u3067\u5b8c\u6210<\/strong>\u3057\u307e\u3059\u3002<br>\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\u306e\u8a08\u7b97\u3082AI\u304c\u81ea\u52d5\u3067\u30c1\u30a7\u30c3\u30af\u3057\u3066\u304f\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"background:#f0fdf4;border:1px solid #22c55e;border-radius:8px;padding:20px 24px;margin:24px 0;\"><div style=\"display:flex;align-items:center;gap:8px;margin-bottom:12px;\"><span style=\"font-size:18px;\">&#128161;<\/span><strong style=\"color:#16a34a;font-size:15px;\">Claude Code\u306f\u975e\u30a8\u30f3\u30b8\u30cb\u30a2\u306b\u3053\u305d\u304a\u3059\u3059\u3081<\/strong><\/div><p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">CSS\u306e\u6587\u6cd5\u3092\u5b8c\u5168\u306b\u7406\u89e3\u3057\u3066\u3044\u306a\u304f\u3066\u3082\u3001\u300c\u3053\u306e\u8272\u306b\u3057\u305f\u3044\u300d\u300c\u3053\u3046\u3044\u3046\u30c7\u30b6\u30a4\u30f3\u306b\u3057\u305f\u3044\u300d\u3068\u3044\u3046\u8981\u671b\u3092\u65e5\u672c\u8a9e\u3067\u4f1d\u3048\u308b\u3060\u3051\u3067Claude\u304cCSS\u3092\u751f\u6210\u3057\u307e\u3059\u3002\u751f\u6210\u3055\u308c\u305f\u30b3\u30fc\u30c9\u3092\u30b3\u30d4\u30fc\u3057\u3066CSS\u30d5\u30a1\u30a4\u30eb\u306b\u8cbc\u308a\u4ed8\u3051\u308b\u3060\u3051\u3067\u3001\u3059\u3050\u306b\u53cd\u6620\u3067\u304d\u307e\u3059\u3002AI\u9b3c\u7ba1\u7406\u306e\u8b1b\u5ea7\u3067\u3082\u3001CSS\u8a2d\u5b9a\u306fClaude Code\u3067\u751f\u6210\u3059\u308b\u306e\u304c\u6700\u901f\u30fb\u6700\u5b89\u5168\u3068\u63a8\u5968\u3057\u3066\u3044\u307e\u3059\u3002<\/p><\/div>\n\n\n\n<div style=\"background:#fef2f2;border:2px solid #dc2626;border-radius:8px;padding:20px 24px;margin:24px 0;\"><div style=\"display:flex;align-items:center;gap:8px;margin-bottom:12px;\"><span style=\"font-size:20px;\">&#9888;&#65039;<\/span><strong style=\"color:#dc2626;font-size:16px;\">\u751f\u6210\u3055\u308c\u305fCSS\u306f\u5fc5\u305a\u52d5\u4f5c\u78ba\u8a8d\u3092<\/strong><\/div><p style=\"margin:0;font-size:15px;line-height:1.8;color:#333;\">Claude Code\u304c\u751f\u6210\u3057\u305fCSS\u306f\u9ad8\u54c1\u8cea\u3067\u3059\u304c\u3001\u30b5\u30a4\u30c8\u56fa\u6709\u306e\u69cb\u9020\u306b\u4f9d\u5b58\u3059\u308b\u90e8\u5206\u306f\u624b\u52d5\u78ba\u8a8d\u304c\u5fc5\u8981\u3067\u3059\u3002\u672c\u756a\u74b0\u5883\u306b\u9069\u7528\u3059\u308b\u524d\u306b\u3001\u958b\u767a\u74b0\u5883\u307e\u305f\u306f\u30b9\u30c6\u30fc\u30b8\u30f3\u30b0\u74b0\u5883\u3067\u52d5\u4f5c\u78ba\u8a8d\u3092\u884c\u3044\u307e\u3057\u3087\u3046\u3002\u7279\u306bbackground-color\u306e\u4e0a\u66f8\u304d\u7af6\u5408\uff08Specificity\uff09\u306f\u5b9f\u969b\u306b\u30d6\u30e9\u30a6\u30b6\u3067\u78ba\u8a8d\u3059\u308b\u306e\u304c\u78ba\u5b9f\u3067\u3059\u3002<\/p><\/div>\n\n\n\n<div class=\"balloon-wrap\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/ceo-sugasawa.jpg\" alt=\"\u4ee3\u8868\u83c5\u6fa4\">\n    <span class=\"balloon-name\">\u4ee3\u8868\u83c5\u6fa4<\/span>\n  <\/div>\n  <div class=\"balloon-body\">AI\u9b3c\u7ba1\u7406\u3067\u306f\u300cCSS\u3092\u66f8\u3051\u306a\u304f\u3066\u3082Web\u30b5\u30a4\u30c8\u3092\u6539\u5584\u3067\u304d\u308b\u300d\u3092\u5b9f\u8df5\u3057\u3066\u3044\u307e\u3059\u3002background-color\u306e\u77e5\u8b58\u3092\u6301\u3063\u305f\u4e0a\u3067Claude\u306b\u6307\u793a\u3092\u51fa\u305b\u3070\u3001\u30b9\u30d4\u30fc\u30c9\u306f10\u500d\u3001\u54c1\u8cea\u306f3\u500d\u306b\u306a\u308a\u307e\u3059\u3002<\/div>\n<\/div>\n\n\n\n<div class=\"balloon-wrap is-right\">\n  <div class=\"balloon-icon\">\n    <img decoding=\"async\" src=\"https:\/\/genai-ai.co.jp\/ai-kanri\/wp-content\/uploads\/2026\/04\/yamazaki-avatar.png\" alt=\"AI\u9b3c\u7ba1\u7406\u5c71\u5d0e\">\n    <span class=\"balloon-name\">AI\u9b3c\u7ba1\u7406\u5c71\u5d0e<\/span>\n  <\/div>\n  <div class=\"balloon-body\">\u300cCSS\u304c\u96e3\u3057\u304f\u3066\u89e6\u308c\u306a\u3044\u300d\u3068\u3044\u3046\u65b9\u3053\u305d\u3001Claude Code\u3092\u8a66\u3057\u3066\u307b\u3057\u3044\u3067\u3059\u3002\u81ea\u5206\u3067\u66f8\u3051\u306a\u304f\u3066\u3082\u3001\u3069\u3046\u3044\u3046\u30c7\u30b6\u30a4\u30f3\u306b\u3057\u305f\u3044\u304b\u3092AI\u306b\u4f1d\u3048\u308b\u3060\u3051\u3067\u30b3\u30fc\u30c9\u304c\u51fa\u3066\u304d\u307e\u3059\u3002\u305d\u308c\u3092\u7406\u89e3\u3059\u308b\u529b\u3092\u3064\u3051\u308b\u3053\u3068\u304c\u3001\u3053\u308c\u304b\u3089\u306eWeb\u30ea\u30c6\u30e9\u30b7\u30fc\u3067\u3059\u3002<\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">background-color\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u57fa\u672c\u304b\u3089\u5fdc\u7528\u307e\u3067\u3001\u30bb\u30af\u30b7\u30e7\u30f3\u5225\u914d\u8272\u30fb\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u30fb\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u30fbClaude Code\u306b\u3088\u308b\u4e00\u62ec\u5909\u66f4\u307e\u3067\u5fb9\u5e95\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<br>\u300cWeb\u30b5\u30a4\u30c8\u306e\u80cc\u666f\u8272\u3092\u81ea\u5206\u3067\u5909\u3048\u3089\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u305f\u3044\u300d\u300cCSS\u304c\u96e3\u3057\u304f\u3066Web\u30c7\u30b6\u30a4\u30f3\u306b\u8e0f\u307f\u51fa\u305b\u306a\u3044\u300d\u2014\u2014\u305d\u3093\u306a\u65b9\u306b\u5411\u3051\u3066\u3001AI\u9b3c\u7ba1\u7406\u3067\u306fClaude Code\u3092\u6d3b\u7528\u3057\u305f\u5b9f\u8df5\u7684\u306aWeb\u5236\u4f5c\u30fb\u696d\u52d9\u81ea\u52d5\u5316\u306e\u652f\u63f4\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<div style=\"background:linear-gradient(135deg,#1a1a1a 0%,#2a1015 100%);border-radius:16px;padding:36px 32px;margin:48px 0 16px;color:#fff;\">\n  <p style=\"font-size:13px;font-weight:700;color:#dc2626;letter-spacing:2px;margin:0 0 12px;\">NEXT STEP<\/p>\n  <p style=\"font-size:22px;font-weight:800;line-height:1.5;margin:0 0 20px;\">\u3053\u306e\u8a18\u4e8b\u306e\u5185\u5bb9\u3092\u3001\u3042\u306a\u305f\u306e\u30d3\u30b8\u30cd\u30b9\u3067<br>\u5b9f\u8df5\u3057\u3066\u307f\u307e\u305b\u3093\u304b\uff1f<\/p>\n  <div style=\"background:rgba(255,255,255,0.06);border:1px solid rgba(255,255,255,0.12);border-radius:12px;padding:24px;max-width:560px;margin:0 auto;\">\n    <p style=\"font-size:13px;color:#dc2626;font-weight:700;margin:0 0 8px;\">AI\u6d3b\u7528\u3092\u81ea\u793e\u3067\u56de\u305b\u308b\u3088\u3046\u306b\u306a\u308a\u305f\u3044\u65b9\u3078<\/p>\n    <p style=\"font-size:20px;font-weight:800;margin:0 0 12px;\">AI\u9b3c\u7ba1\u7406<\/p>\n    <p style=\"font-size:14px;color:rgba(255,255,255,0.75);margin:0 0 20px;line-height:1.7;\">Claude Code\u30fbCowork\u5c0e\u5165\u652f\u63f4\u304b\u3089\u696d\u52d9\u8a2d\u8a08\u30fb\u793e\u5185\u6d78\u900f\u307e\u3067\u5b9f\u8df5\u30d9\u30fc\u30b9\u3067\u4f34\u8d70\u3002\u300c\u81ea\u793e\u3067\u56de\u305b\u308b\u7d44\u7e54\u300d\u309290\u65e5\u3067\u4f5c\u308b\u7d4c\u55b6\u8005\u5411\u3051\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\u3002<\/p>\n    <div style=\"text-align:center;\">\n      <a href=\"https:\/\/aikanri.genai-ai.co.jp\/?utm_source=blog&utm_medium=article&utm_campaign=cc-css-background&utm_content=next-step-cta\" target=\"_blank\" rel=\"noopener\" style=\"display:inline-block;background:#dc2626;color:#fff;font-weight:700;font-size:15px;padding:14px 32px;border-radius:30px;text-decoration:none;\">AI\u9b3c\u7ba1\u7406\u3092\u8a73\u3057\u304f\u898b\u308b \u2192<\/a>\n    <\/div>\n  <\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"faq\">\u3088\u304f\u3042\u308b\u8cea\u554f<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Q. CSS background-color\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. CSS\u306ebackground-color\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u3001HTML\u8981\u7d20\u306e\u80cc\u666f\u8272\u3092\u8a2d\u5b9a\u3059\u308b\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u3059\u3002\u300cbackground-color: #f8f9fa;\u300d\u306e\u3088\u3046\u306b\u66f8\u304f\u3068\u3001\u305d\u306e\u8981\u7d20\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u9818\u57df\u3068\u30d1\u30c7\u30a3\u30f3\u30b0\u9818\u57df\u304c\u6307\u5b9a\u3057\u305f\u8272\u3067\u5857\u308a\u3064\u3076\u3055\u308c\u307e\u3059\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306ftransparent\uff08\u900f\u660e\uff09\u3067\u3001\u6587\u5b57\u8272\u3092\u5909\u3048\u308bcolor\u30d7\u30ed\u30d1\u30c6\u30a3\u3068\u306f\u5225\u306b\u4f7f\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q. background-color\u3067\u4f7f\u3048\u308b\u8272\u306e\u6307\u5b9a\u65b9\u6cd5\u306f\u4f55\u7a2e\u985e\u3042\u308a\u307e\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. \u4e3b\u306b4\u7a2e\u985e\u3042\u308a\u307e\u3059\u3002\u2460\u30ab\u30e9\u30fc\u540d\uff08red, white, navy\u7b49\uff09\u3001\u2461HEX\u30b3\u30fc\u30c9\uff08#dc2626\u7b49\u306e16\u9032\u6570\uff09\u3001\u2462RGB\uff08rgb(220,38,38)\u7b49\u306e0\u301c255\u6307\u5b9a\uff09\u3001\u2463HSL\uff08hsl(0,72%,51%)\u7b49\u306e\u8272\u76f8\u30fb\u5f69\u5ea6\u30fb\u660e\u5ea6\u6307\u5b9a\uff09\u3067\u3059\u3002\u534a\u900f\u660e\u306b\u3057\u305f\u3044\u5834\u5408\u306fRGBA\u3084HSLA\uff08\u30a2\u30eb\u30d5\u30a1\u5024\u4ed8\u304d\uff09\u3092\u4f7f\u3044\u307e\u3059\u3002\u672c\u756a\u30b3\u30fc\u30c9\u306b\u306fHEX\u304c\u6700\u3082\u3088\u304f\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q. background-color\u3067\u534a\u900f\u660e\u306e\u80cc\u666f\u8272\u306b\u3059\u308b\u306b\u306f\u3069\u3046\u3059\u308c\u3070\u3044\u3044\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. rgba()\u95a2\u6570\u3092\u4f7f\u3044\u307e\u3059\u3002rgba(\u8d64, \u7dd1, \u9752, \u900f\u660e\u5ea6)\u306e\u5f62\u5f0f\u3067\u3001\u900f\u660e\u5ea6\u306f0\uff08\u5b8c\u5168\u900f\u660e\uff09\u301c1\uff08\u5b8c\u5168\u4e0d\u900f\u660e\uff09\u306e\u5c0f\u6570\u3067\u6307\u5b9a\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070reba(220,38,38,0.1)\u306f\u8d64\u309210%\u306e\u900f\u660e\u5ea6\uff08\u307b\u307c\u900f\u660e\uff09\u3067\u9069\u7528\u3057\u307e\u3059\u3002\u8b66\u544a\u30dc\u30c3\u30af\u30b9\u306e\u80cc\u666f\u306breba(220,38,38,0.08)\u306e\u3088\u3046\u306a\u8584\u3044\u8d64\u3092\u4f7f\u3046\u306e\u304c\u3088\u304f\u3042\u308b\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q. background-color\u3068background\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. background-color\u306f\u80cc\u666f\u8272\u3060\u3051\u3092\u8a2d\u5b9a\u3059\u308b\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u3059\u3002background\u306f\u30b7\u30e7\u30fc\u30c8\u30cf\u30f3\u30c9\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u3001\u80cc\u666f\u8272\u30fb\u80cc\u666f\u753b\u50cf\u30fb\u4f4d\u7f6e\u30fb\u30b5\u30a4\u30ba\u306a\u3069\u3092\u4e00\u62ec\u3067\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002\u80cc\u666f\u8272\u3060\u3051\u3092\u5909\u3048\u305f\u3044\u5834\u5408\u306fbackground-color\u3092\u4f7f\u3046\u306e\u304c\u5b89\u5168\u3067\u3059\u3002background\u3067\u4e0a\u66f8\u304d\u3059\u308b\u3068\u3001\u4ee5\u524d\u8a2d\u5b9a\u3057\u305f\u80cc\u666f\u753b\u50cf\u306a\u3069\u306e\u8a2d\u5b9a\u304c\u6d88\u3048\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q. \u30db\u30d0\u30fc\u6642\u306bbackground-color\u3092\u5909\u3048\u308b\u306b\u306f\u3069\u3046\u3059\u308c\u3070\u3044\u3044\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. CSS\u64ec\u4f3c\u30af\u30e9\u30b9\u306e:hover\u3092\u4f7f\u3044\u307e\u3059\u3002\u300c.btn:hover { background-color: #b91c1c; }\u300d\u306e\u3088\u3046\u306b\u901a\u5e38\u306ebackground-color\u3068\u306f\u5225\u306b\u66f8\u304d\u307e\u3059\u3002\u3055\u3089\u306btransition: background-color 0.2s ease; \u3092\u5143\u306e\u30b9\u30bf\u30a4\u30eb\u306b\u8ffd\u52a0\u3059\u308b\u3068\u3001\u8272\u306e\u5909\u5316\u304c\u306a\u3081\u3089\u304b\u306a\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306b\u306a\u308a\u3001UI\u306e\u5b8c\u6210\u5ea6\u304c\u4e0a\u304c\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q. \u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u3067background-color\u3092\u81ea\u52d5\u5207\u308a\u66ff\u3048\u3059\u308b\u306b\u306f\u3069\u3046\u3059\u308c\u3070\u3044\u3044\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. CSS\u306e@media (prefers-color-scheme: dark) \u3092\u4f7f\u3044\u307e\u3059\u3002\u3053\u306e\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u306e\u30d6\u30ed\u30c3\u30af\u5185\u306b\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u7528\u306e\u8272\u3092\u66f8\u304f\u3068\u3001\u30e6\u30fc\u30b6\u30fc\u306eOS\u8a2d\u5b9a\u304c\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u306e\u5834\u5408\u306b\u81ea\u52d5\u3067\u9069\u7528\u3055\u308c\u307e\u3059\u3002CSS\u5909\u6570\uff08--bg-page: #111827 \u7b49\uff09\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3068\u7ba1\u7406\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002Claude Code\u306b\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u5bfe\u5fdcCSS\u306e\u751f\u6210\u3092\u4f9d\u983c\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q. background-color\u3092\u8a2d\u5b9a\u3059\u308b\u3068\u304d\u306e\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u306e\u6ce8\u610f\u70b9\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. \u30c6\u30ad\u30b9\u30c8\u8272\u3068\u80cc\u666f\u8272\u306e\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\u304cWCAG AA\u57fa\u6e96\uff08\u901a\u5e38\u30c6\u30ad\u30b9\u30c8\u30674.5:1\u4ee5\u4e0a\uff09\u3092\u6e80\u305f\u3057\u3066\u3044\u308b\u304b\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u767d\u80cc\u666f\uff08#ffffff\uff09\u3067\u306f#767676\u3088\u308a\u3082\u8584\u3044\u8272\u306fAA\u57fa\u6e96\u3092\u4e0b\u56de\u308a\u307e\u3059\u3002\u88dc\u8db3\u30c6\u30ad\u30b9\u30c8\u306b\u4f7f\u3046\u6700\u8584\u30e9\u30a4\u30f3\u306f#6b7280\uff08\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd44.6:1\uff09\u304c\u76ee\u5b89\u3067\u3059\u3002WebAIM Contrast Checker\u306a\u3069\u306e\u30c4\u30fc\u30eb\u3067\u7121\u6599\u30c1\u30a7\u30c3\u30af\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q. Claude Code\u3092\u4f7f\u3046\u3068background-color\u306e\u8a2d\u5b9a\u304c\u3069\u3046\u5909\u308f\u308a\u307e\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A. Claude Code\u306b\u300c\u3053\u306eCSS\u306e\u30c6\u30fc\u30de\u30ab\u30e9\u30fc\u3092\u5909\u3048\u3066\u300d\u300cbackground-color\u3092CSS\u5909\u6570\u306b\u79fb\u884c\u3057\u3066\u300d\u300c\u30c0\u30fc\u30af\u30e2\u30fc\u30c9\u5bfe\u5fdc\u3092\u8ffd\u52a0\u3057\u3066\u300d\u306a\u3069\u65e5\u672c\u8a9e\u3067\u6307\u793a\u3059\u308b\u3060\u3051\u3067\u3001AI\u304cCSS\u3092\u81ea\u52d5\u7684\u306b\u66f8\u304d\u76f4\u3057\u307e\u3059\u3002\u624b\u52d5\u3067\u306f\u6570\u6642\u9593\u304b\u304b\u308b\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u304c\u6570\u5341\u79d2\u3067\u5b8c\u4e86\u3057\u3001\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\u306e\u30c1\u30a7\u30c3\u30af\u307e\u3067AI\u304c\u3084\u3063\u3066\u304f\u308c\u307e\u3059\u3002\u975e\u30a8\u30f3\u30b8\u30cb\u30a2\u3067\u3082\u6d3b\u7528\u3067\u304d\u308b\u30c4\u30fc\u30eb\u3067\u3059\u3002<\/p>\n\n\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"CSS background-color\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"CSS\u306ebackground-color\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u3001HTML\u8981\u7d20\u306e\u80cc\u666f\u8272\u3092\u8a2d\u5b9a\u3059\u308b\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u3059\u3002\u300cbackground-color: #f8f9fa;\u300d\u306e\u3088\u3046\u306b\u66f8\u304f\u3068\u3001\u305d\u306e\u8981\u7d20\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u9818\u57df\u3068\u30d1\u30c7\u30a3\u30f3\u30b0\u9818\u57df\u304c\u6307\u5b9a\u3057\u305f\u8272\u3067\u5857\u308a\u3064\u3076\u3055\u308c\u307e\u3059\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306ftransparent\uff08\u900f\u660e\uff09\u3067\u3001\u6587\u5b57\u8272\u3092\u5909\u3048\u308bcolor\u30d7\u30ed\u30d1\u30c6\u30a3\u3068\u306f\u5225\u306b\u4f7f\u3044\u307e\u3059\u3002\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"background-color\u3067\u4f7f\u3048\u308b\u8272\u306e\u6307\u5b9a\u65b9\u6cd5\u306f\u4f55\u7a2e\u985e\u3042\u308a\u307e\u3059\u304b\uff1f\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"\u4e3b\u306b4\u7a2e\u985e\u3042\u308a\u307e\u3059\u3002\u2460\u30ab\u30e9\u30fc\u540d\uff08red, white, navy\u7b49\uff09\u3001\u2461HEX\u30b3\u30fc\u30c9\uff08#dc2626\u7b49\u306e16\u9032\u6570\uff09\u3001\u2462RGB\uff08rgb(220,38,38)\u7b49\u306e0\u301c255\u6307\u5b9a\uff09\u3001\u2463HSL\uff08hsl(0,72%,51%)\u7b49\u306e\u8272\u76f8\u30fb\u5f69\u5ea6\u30fb\u660e\u5ea6\u6307\u5b9a\uff09\u3067\u3059\u3002\u534a\u900f\u660e\u306b\u3057\u305f\u3044\u5834\u5408\u306fRGBA\u3084HSLA\uff08\u30a2\u30eb\u30d5\u30a1\u5024\u4ed8\u304d\uff09\u3092\u4f7f\u3044\u307e\u3059\u3002\u672c\u756a\u30b3\u30fc\u30c9\u306b\u306fHEX\u304c\u6700\u3082\u3088\u304f\u4f7f\u308f\u308c\u307e\u3059\u3002\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"background-color\u3067\u534a\u900f\u660e\u306e\u80cc\u666f\u8272\u306b\u3059\u308b\u306b\u306f\u3069\u3046\u3059\u308c\u3070\u3044\u3044\u3067\u3059\u304b\uff1f\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"rgba()\u95a2\u6570\u3092\u4f7f\u3044\u307e\u3059\u3002rgba(\u8d64, \u7dd1, \u9752, \u900f\u660e\u5ea6)\u306e\u5f62\u5f0f\u3067\u3001\u900f\u660e\u5ea6\u306f0\uff08\u5b8c\u5168\u900f\u660e\uff09\u301c1\uff08\u5b8c\u5168\u4e0d\u900f\u660e\uff09\u306e\u5c0f\u6570\u3067\u6307\u5b9a\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070reba(220,38,38,0.1)\u306f\u8d64\u309210%\u306e\u900f\u660e\u5ea6\uff08\u307b\u307c\u900f\u660e\uff09\u3067\u9069\u7528\u3057\u307e\u3059\u3002\u8b66\u544a\u30dc\u30c3\u30af\u30b9\u306e\u80cc\u666f\u306breba(220,38,38,0.08)\u306e\u3088\u3046\u306a\u8584\u3044\u8d64\u3092\u4f7f\u3046\u306e\u304c\u3088\u304f\u3042\u308b\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"background-color\u3068background\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"background-color\u306f\u80cc\u666f\u8272\u3060\u3051\u3092\u8a2d\u5b9a\u3059\u308b\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u3059\u3002background\u306f\u30b7\u30e7\u30fc\u30c8\u30cf\u30f3\u30c9\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u3001\u80cc\u666f\u8272\u30fb\u80cc\u666f\u753b\u50cf\u30fb\u4f4d\u7f6e\u30fb\u30b5\u30a4\u30ba\u306a\u3069\u3092\u4e00\u62ec\u3067\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002\u80cc\u666f\u8272\u3060\u3051\u3092\u5909\u3048\u305f\u3044\u5834\u5408\u306fbackground-color\u3092\u4f7f\u3046\u306e\u304c\u5b89\u5168\u3067\u3059\u3002background\u3067\u4e0a\u66f8\u304d\u3059\u308b\u3068\u3001\u4ee5\u524d\u8a2d\u5b9a\u3057\u305f\u80cc\u666f\u753b\u50cf\u306a\u3069\u306e\u8a2d\u5b9a\u304c\u6d88\u3048\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"\u30db\u30d0\u30fc\u6642\u306bbackground-color\u3092\u5909\u3048\u308b\u306b\u306f\u3069\u3046\u3059\u308c\u3070\u3044\u3044\u3067\u3059\u304b\uff1f\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"CSS\u64ec\u4f3c\u30af\u30e9\u30b9\u306e:hover\u3092\u4f7f\u3044\u307e\u3059\u3002\u300c.btn:hover { background-color: #b91c1c; }\u300d\u306e\u3088\u3046\u306b\u901a\u5e38\u306ebackground-color\u3068\u306f\u5225\u306b\u66f8\u304d\u307e\u3059\u3002\u3055\u3089\u306btransition: background-color 0.2s ease; \u3092\u5143\u306e\u30b9\u30bf\u30a4\u30eb\u306b\u8ffd\u52a0\u3059\u308b\u3068\u3001\u8272\u306e\u5909\u5316\u304c\u306a\u3081\u3089\u304b\u306a\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306b\u306a\u308a\u3001UI\u306e\u5b8c\u6210\u5ea6\u304c\u4e0a\u304c\u308a\u307e\u3059\u3002\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": 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