{"id":9464,"date":"2025-05-26T19:04:33","date_gmt":"2025-05-26T10:04:33","guid":{"rendered":"https:\/\/techmania.jp\/blog\/?p=9464"},"modified":"2025-07-11T22:03:58","modified_gmt":"2025-07-11T13:03:58","slug":"css-opacity","status":"publish","type":"post","link":"https:\/\/techmania.jp\/blog\/css-opacity\/","title":{"rendered":"\u3010CSS\u5165\u9580\u3011opacity\u3067\u8981\u7d20\u3092\u900f\u660e\u306b\u3059\u308b\u65b9\u6cd5\u3068\u6d3b\u7528\u4f8b\u307e\u3068\u3081"},"content":{"rendered":"\n<p>WEB\u30b5\u30a4\u30c8\u3092\u4f5c\u6210\u3059\u308b\u969b\u306b\u3001\u7279\u5b9a\u306e\u8981\u7d20\u3092\u900f\u904e\u3055\u305b\u305f\u3044\u5834\u9762\u304c\u4e2d\u306b\u306f\u3042\u308b\u3068\u601d\u3044\u307e\u3059\u3002<br>\u80cc\u666f\u753b\u50cf\u306e\u524d\u9762\u306b\u7f6e\u3044\u305f\u30c6\u30ad\u30b9\u30c8\u3092\u8aad\u307f\u3084\u3059\u304f\u3059\u308b\u305f\u3081\u306b\u753b\u50cf\u3092\u900f\u904e\u3055\u305b\u305f\u308a\u3001\u30dc\u30bf\u30f3\u3084\u8981\u7d20\u306e\u9078\u629e\u72b6\u614b\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u3059\u308b\u305f\u3081\u306b\u5909\u5316\u3055\u305b\u305f\u308a\u306a\u3069\u3001\u30b1\u30fc\u30b9\u306f\u69d8\u3005\u3067\u3059\u3002<\/p>\n\n\n\n<p>CSS\u3067\u7279\u5b9a\u306e\u8981\u7d20\u3092\u900f\u904e\u3055\u305b\u308b\u65b9\u6cd5\u306f\u3044\u304f\u3064\u304b\u3042\u308a\u307e\u3059\u304c\u3001\u4eca\u56de\u306f\u305d\u306e\u4e2d\u306e1\u3064\u3067\u3042\u308b \u300c<strong>opacity<\/strong>\u300d \u306e\u4f7f\u7528\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__1\" class=\"wp-block-heading\">opacity\u3068\u306f\uff1f<\/h2>\n\n\n\n<p>opacity\u306fCSS\u3067\u8981\u7d20\u306e\u4e0d\u900f\u660e\u5ea6\u3092\u8a2d\u5b9a\u3059\u308b\u305f\u3081\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u3059\u3002\u4e0d\u900f\u660e\u5ea6\u306e\u5024\u3092\u5c0f\u3055\u304f\u3059\u308b\u307b\u3069\u8981\u7d20\u304c\u900f\u3051\u3066\u3001\u80cc\u666f\u3084\u4e0b\u5c64\u306e\u8981\u7d20\u304c\u898b\u3048\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<br>opacity\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306f <strong>1<\/strong> \u3067\u3001\u5b8c\u5168\u306b\u4e0d\u900f\u660e\u306a\u72b6\u614b\uff08\u8272\u304c\u306f\u3063\u304d\u308a\u3068\u898b\u3048\u3066\u3044\u308b\u72b6\u614b\uff09\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>opacity\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u4f8b\u306e\u3088\u3046\u306b\u8981\u7d20\u3092\u900f\u904e\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u4f7f\u7528\u4f8b\u3011<\/strong><\/p>\n\n\n\n<style>\n    .sample {\n        display: flex;\n        justify-content: center;\n        align-items: center;\n        height: 360px;\n        position: relative;\n    }\n\n    .sampleOpacity {\n        height: 200px;\n        width: 200px;\n        position: absolute;\n        top: 80px;\n        left: 50px;\n        background-color: #dc143c;\n    }\n\n    .sampleOpacity2 {\n        height: 200px;\n        width: 200px;\n        background-color: #00ffff;\n        position: absolute;\n        top: 0;\n        left: 0;\n        opacity: 0.7;\n        z-index: 2;\n    }\n<\/style>\n<div class=\"sample\">\n    <div class=\"sampleOpacity\">\n\n    <\/div>\n    <div class=\"sampleOpacity2\">\n\n    <\/div>\n<\/div>\n\n\n\n<p>opacity\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u53e4\u3044\u30d6\u30e9\u30a6\u30b6\u3067\u3082\u554f\u984c\u306a\u304f\u52d5\u4f5c\u3057\u3066\u304f\u308c\u308b\u305f\u3081\u3001\u30d6\u30e9\u30a6\u30b6\u306e\u9055\u3044\u3092\u8003\u3048\u308b\u3053\u3068\u306a\u304f\u6c17\u8efd\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u304c\u5229\u70b9\u306e\uff11\u3064\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u53c2\u8003: Can I use: CSS3 Opacity<\/p>\n\n\n\n<p><a href=\"https:\/\/caniuse.com\/css-opacity\">https:\/\/caniuse.com\/css-opacity<\/a><\/p>\n\n\n\n<h2 id=\"outline__2\" class=\"wp-block-heading\">opacity\u306e\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<p>opacity\u3092\u4f7f\u7528\u3059\u308b\u969b\u306f\u3001\u4ee5\u4e0b\u306e\u69cb\u6587\u3067\u30b3\u30fc\u30c9\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\" data-show-lang=\"1\"><code>\u30bb\u30ec\u30af\u30bf\u30fc {\n    opacity: \u6570\u5024\uff080\uff5e1.0\uff09\u3082\u3057\u304f\u306f\u30d1\u30fc\u30bb\u30f3\u30c6\u30fc\u30b8;\n}<\/code><\/pre><\/div>\n\n\n\n<p>\u6570\u5024\u306e\u5834\u5408\u306f 0.0 \u4ee5\u4e0a 1.0 \u4ee5\u4e0b\u3001\u30d1\u30fc\u30bb\u30f3\u30c6\u30fc\u30b8\u306e\u5834\u5408\u306f 0% \u4ee5\u4e0a 100% \u4ee5\u4e0b\u306e\u7bc4\u56f2\u3067\u3001\u8981\u7d20\u306e\u4e0d\u900f\u660e\u5ea6\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<br>\uff10\u306b\u8fd1\u3065\u304f\u307b\u3069\u900f\u660e\u306b\u306a\u308a\u3001\uff11\u306b\u8fd1\u3065\u304f\u307b\u3069\u4e0d\u900f\u660e\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u5b9f\u88c5\u4f8b\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\" data-show-lang=\"1\"><code>&lt;style&gt;\n    .container {\n        display: flex;\n        gap: 10px;\n    }\n\n    .square {\n        width: 60px;\n        height: 60px;\n        background-color: coral;\n    }\n&lt;\/style&gt;\n&lt;div class=&quot;container&quot;&gt;\n    &lt;div class=&quot;square&quot; style=&quot;opacity: 0.3&quot;&gt;30%&lt;\/div&gt;\n    &lt;div class=&quot;square&quot; style=&quot;opacity: 0.5&quot;&gt;50%&lt;\/div&gt;\n    &lt;div class=&quot;square&quot; style=&quot;opacity: 0.7&quot;&gt;70%&lt;\/div&gt;\n    &lt;div class=&quot;square&quot; style=&quot;opacity: 1.0&quot;&gt;100%&lt;\/div&gt;\n&lt;\/div&gt;<\/code><\/pre><\/div>\n\n\n\n<style>\n    .container {\n        display: flex;\n        gap: 10px;\n    }\n\n    .square {\n        width: 60px;\n        height: 60px;\n        background-color: coral;\n    }\n<\/style>\n<div class=\"container\">\n    <div class=\"square\" style=\"opacity: 0.3\">30%<\/div>\n    <div class=\"square\" style=\"opacity: 0.5\">50%<\/div>\n    <div class=\"square\" style=\"opacity: 0.7\">70%<\/div>\n    <div class=\"square\" style=\"opacity: 1.0\">100%<\/div>\n<\/div>\n\n\n\n<p>\u5148\u307b\u3069\u306e\u89e3\u8aac\u6642\u306b\u898b\u305b\u305f\u4e00\u4f8b\u3092\u3082\u3068\u306b\u3001\u5b9f\u969b\u306e\u30b3\u30fc\u30c9\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\uff08HTML\uff09\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\" data-show-lang=\"1\"><code>&lt;div class=&quot;sample&quot;&gt;\n    &lt;div class=&quot;sampleOpacity&quot;&gt;\n\n    &lt;\/div&gt;\n    &lt;div class=&quot;sampleOpacity2&quot;&gt;\n\n    &lt;\/div&gt;\n&lt;\/div&gt;<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\uff08CSS\uff09\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\" data-show-lang=\"1\"><code>.sample {\n    display: flex;\n    justify-content: center;\n    align-items: center;\n    height: 100vh;\n    margin: 0;\n    position: relative;\n}\n.sampleOpacity {\n    height: 200px;\n    width: 200px;\n    position: absolute;\n    top: 120px;\n    left: 100px;\n    background-color: #dc143c;\n}\n.sampleOpacity2 {\n    height: 200px;\n    width: 200px;\n    background-color: #00ffff;\n    position: absolute;\n    top: 0;\n    left: 0;\n    opacity: 0.7;\n    z-index: 2;\n}<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u88c5\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<style>\n    .sample {\n        display: flex;\n        justify-content: center;\n        align-items: center;\n        height: 360px;\n        position: relative;\n    }\n\n    .sampleOpacity {\n        height: 200px;\n        width: 200px;\n        position: absolute;\n        top: 80px;\n        left: 50px;\n        background-color: #dc143c;\n    }\n\n    .sampleOpacity2 {\n        height: 200px;\n        width: 200px;\n        background-color: #00ffff;\n        position: absolute;\n        top: 0;\n        left: 0;\n        opacity: 0.7;\n        z-index: 2;\n    }\n<\/style>\n<div class=\"sample\">\n    <div class=\"sampleOpacity\">\n\n    <\/div>\n    <div class=\"sampleOpacity2\">\n\n    <\/div>\n<\/div>\n\n\n\n<p>\u4e0a\u306b\u91cd\u306d\u305f\u65b9\u306e\u8981\u7d20\u304c\u5c11\u3057\u900f\u660e\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u306d\u3002<br>\u4e0a\u8a18\u306e\u4f8b\u3092\u3001\u30d1\u30fc\u30bb\u30f3\u30c6\u30fc\u30b8\u3092\u4f7f\u7528\u3057\u3066\u540c\u3058\u900f\u904e\u5ea6\u5408\u3044\u306b\u3059\u308b\u5834\u5408\u306f\u300170\uff05\u3068\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__3\" class=\"wp-block-heading\">opacity\u306e\u6d3b\u7528\u4f8b<\/h2>\n\n\n\n<p>opacity\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u305f\u3068\u3053\u308d\u3067\u3001\u7d9a\u3044\u3066\u306f\u5b9f\u969b\u306eWeb\u30b5\u30a4\u30c8\u3067\u3082\u4f7f\u7528\u3067\u304d\u308b\u3044\u304f\u3064\u304b\u306e\u5b9f\u88c5\u4f8b\u306b\u3064\u3044\u3066\u7d39\u4ecb\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u9806\u306b\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 id=\"outline__3_1\" class=\"wp-block-heading\">\u30de\u30a6\u30b9\u30ab\u30fc\u30bd\u30eb\u3092\u91cd\u306d\u305f\u3068\u304d\u306b\u5c11\u3057\u900f\u660e\u306b\u3059\u308b<\/h3>\n\n\n\n<p>\uff11\u3064\u76ee\u306f\u3001\u30de\u30a6\u30b9\u30ab\u30fc\u30bd\u30eb\u3092\u91cd\u306d\u305f\u969b\u306b\u8981\u7d20\u3092\u534a\u900f\u660e\u306b\u3059\u308b\u4f7f\u7528\u4f8b\u3067\u3059\u3002<br>\u3088\u304f\u3042\u308b\u4f8b\u3068\u3057\u3066\u306f\u3001\u30dc\u30bf\u30f3\u306b\u30ab\u30fc\u30bd\u30eb\u3092\u5408\u308f\u305b\u305f\u6642\u306e\u72b6\u614b\u5909\u5316\u306a\u3069\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\uff08HTML\uff09\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\" data-show-lang=\"1\"><code>&lt;div class=&quot;sample&quot;&gt;\n    &lt;a class=&quot;sampleButton&quot; href=&quot;&quot;&gt;\n        sample\n    &lt;\/a&gt;\n&lt;\/div&gt;<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\uff08CSS\uff09\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\" data-show-lang=\"1\"><code>.sample {\n    display: flex;\n    justify-content: center;\n    align-items: center;\n    height: 100vh;\n    margin: 0;\n}\n.sampleButton {\n    text-decoration: none;\n    width: 200px;\n    border-radius: 100vmax;\n    padding: 15px;\n    text-align: center;\n    color: #ffffff;\n    font-size: 18px;\n    background-color: #ff007f;\n    box-shadow: 0 5px 15px 0 #9E9E9E;\n}\n.sampleButton:hover {\n    opacity: 0.6;\n}<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u88c5\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<style>\n    .sample2 {\n        display: flex;\n        justify-content: center;\n        align-items: center;\n        margin: 5%;\n    }\n\n    .sampleButton {\n        text-decoration: none;\n        width: 200px;\n        border-radius: 100vmax;\n        padding: 15px;\n        text-align: center;\n        color: #ffffff!important;\n        font-size: 18px;\n        background-color: #ff007f;\n        box-shadow: 0 5px 15px 0 #9E9E9E;\n    }\n\n    .sampleButton:hover {\n        opacity: 0.6;\n    }\n<\/style>\n<div class=\"sample2\">\n    <a class=\"sampleButton\" href=\"\">\n        sample\n    <\/a>\n<\/div>\n\n\n\n<p>\u7591\u4f3c\u30af\u30e9\u30b9\u306e \u300c:hover\u300d \u306b opacity\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u9069\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30de\u30a6\u30b9\u30aa\u30fc\u30d0\u30fc\u6642\u306b\u30dc\u30bf\u30f3\u3092\u900f\u904e\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br>\u3053\u306e\u3088\u3046\u306b\u72b6\u614b\u3092\u5909\u5316\u3055\u305b\u308b\u3053\u3068\u3067\u3001\u30dc\u30bf\u30f3\u306b\u30ab\u30fc\u30bd\u30eb\u304c\u5408\u308f\u3055\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u8996\u899a\u7684\u306b\u3082\u5206\u304b\u308a\u3084\u3059\u304f\u306a\u308b\u305f\u3081\u3001\u52b9\u679c\u7684\u306a\u6f14\u51fa\u65b9\u6cd5\u306e\uff11\u3064\u3067\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__3_2\" class=\"wp-block-heading\">\u3086\u3063\u304f\u308a\u3068\u6d6e\u304b\u3073\u4e0a\u304c\u3089\u305b\u308b<\/h3>\n\n\n\n<p>\uff12\u3064\u76ee\u306f\u3001\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u52d5\u4f5c\u306b\u9069\u7528\u3059\u308b\u4f7f\u7528\u4f8b\u3067\u3059\u3002<br>\u6587\u5b57\u3084\u753b\u50cf\u306a\u3069\u306e\u8981\u7d20\u306b\u52d5\u304d\u3092\u52a0\u3048\u305f\u3044\u969b\u306b\u3001opacity\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\uff08HTML\uff09\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\" data-show-lang=\"1\"><code>&lt;div class=&quot;sample&quot;&gt;\n    &lt;img class=&quot;sampleLogo.png&quot;&gt;\n&lt;\/div&gt;<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\uff08CSS\uff09\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\" data-show-lang=\"1\"><code>.sample {\n    display: flex;\n    justify-content: center;\n    align-items: center;\n    margin: 0;\n}\n.sampleAnimation {\n    display: block;\n    width: 250px;\n    height: 250px;\n    position: relative;\n    animation: sampleAnime 2s ease-out;\n}\n@keyframes sampleAnime {\n    from {\n        opacity: 0;\n        bottom: 50px;\n    }\n    to {\n        opacity: 1;\n        bottom: 0px;\n    }\n}<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u88c5\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<style>\n    .sample3 {\n        display: flex;\n        justify-content: center;\n        align-items: center;\n        margin: 0;\n    }\n\n    .sampleAnimation {\n        display: block;\n        width: 250px;\n        height: 250px;\n\n        position: relative;\n        animation: sampleAnime 2s ease-out infinite;\n    }\n\n    @keyframes sampleAnime {\n        from {\n            opacity: 0;\n            bottom: 50px;\n        }\n\n        to {\n            opacity: 1;\n            bottom: 0px;\n        }\n    }\n<\/style>\n<div class=\"sample3\">\n    <img decoding=\"async\" class=\"sampleAnimation\" src=\"https:\/\/techmania.jp\/blog\/wp-content\/uploads\/2023\/07\/techmania.png\">\n<\/div>\n\n\n\n<p>animation\u30d7\u30ed\u30d1\u30c6\u30a3\u3068 opacity\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u3053\u306e\u3088\u3046\u306a\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__3_3\" class=\"wp-block-heading\">\u753b\u50cf\u3092\u900f\u904e\u3055\u305b\u3066\u80cc\u666f\u3068\u3057\u3066\u4f7f\u7528\u3059\u308b<\/h3>\n\n\n\n<p>\uff13\u3064\u76ee\u306f\u3001\u753b\u50cf\u3092\u80cc\u666f\u3068\u3057\u3066\u4f7f\u7528\u3059\u308b\u969b\u306b\u900f\u904e\u3055\u305b\u308b\u30b1\u30fc\u30b9\u3067\u3059\u3002<br>\u900f\u904e\u3057\u306a\u3044\u307e\u307e\u80cc\u666f\u306b\u9069\u7528\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u3001\u753b\u50cf\u306b\u3088\u3063\u3066\u306f\u30c6\u30ad\u30b9\u30c8\u306a\u3069\u304c\u898b\u3048\u3065\u3089\u304f\u306a\u308b\u5834\u5408\u304c\u3042\u308b\u305f\u3081\u3001opacity\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f7f\u7528\u3057\u3066\u4e0d\u900f\u660e\u5ea6\u3092\u8abf\u6574\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\uff08HTML\uff09\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\" data-show-lang=\"1\"><code>&lt;div class=&quot;sample&quot;&gt;\n    &lt;div class=&quot;sampleBackground&quot;&gt;\n    &lt;\/div&gt;\n    &lt;div class=&quot;sampleText&quot;&gt;\n        &lt;p&gt;sample&lt;\/p&gt;\n    &lt;\/div&gt;\n&lt;\/div&gt;<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\uff08CSS\uff09\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\" data-show-lang=\"1\"><code>.sample {\n  display: flex;\n  justify-content: center;\n  align-items: center;\n  background-color: rgb(102 205 170 \/ .6);\n  height: 100vh;\n  margin: 0;\n}\n\n.sampleBackground {\n    height:  60%;\n    width:  90%;\n    background-image:  url(sampleImage.jpg);\n    background-size:  cover;\n\n    position:  absolute;\n    left: 20px;\n    top: 20px;\n    z-index:  -1;\n    opacity:  0.8;\n}\n\n.sampleText {\n    position: absolute;\n    font-size:  50px;\n    color:  rgb(255 255 255);\n    top: 10%;\n    left: 35%;\n    z-index:  99;\n}<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u88c5\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<style>\n    .sample4 {\n        display: flex;\n        justify-content: center;\n        align-items: center;\n        height: 360px;\n        margin: 0;\n        position: relative;\n    }\n\n    .sampleBackground {\n        height: 90%;\n        width: 90%;\n        background-image: url(https:\/\/techmania.jp\/blog\/wp-content\/uploads\/2023\/07\/techmania.png);\n        background-size: contain;\n        background-repeat: no-repeat;\n        z-index: 1;\n        opacity: 0.6;\n    }\n\n    .sampleText {\n        position: absolute;\n        font-size: 50px;\n        color: #000;\n        top: 10%;\n        left: 10%;\n        z-index: 99;\n    }\n<\/style>\n<div class=\"sample4\">\n    <div class=\"sampleBackground\">\n    <\/div>\n    <div class=\"sampleText\">\n        <p>sample<\/p>\n    <\/div>\n<\/div>\n\n\n\n<p>\u524d\u8ff0\u306e\u901a\u308a\u3001rgb\u95a2\u6570\u3067\u306f\u753b\u50cf\u306e\u900f\u904e\u3092\u884c\u3046\u3053\u3068\u306f\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u3053\u306e\u3088\u3046\u306b opacity\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f7f\u7528\u3057\u3066\u4e0d\u900f\u660e\u5ea6\u3092\u8abf\u6574\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4e0a\u8a18\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u753b\u50cf\u81ea\u4f53\u3092\u900f\u904e\u3055\u305b\u3066\u3044\u307e\u3059\u304c\u3001\u753b\u50cf\u306e\u4e0d\u900f\u660e\u5ea6\u306f\u5909\u66f4\u305b\u305a\u306b\u4e0a\u304b\u3089\u900f\u904e\u3057\u305f\u80cc\u666f\u8272\u3092\u88ab\u305b\u308b\u3053\u3068\u3067\u3001\u4f3c\u305f\u3088\u3046\u306a\u52b9\u679c\u3092\u5f97\u308b\u65b9\u6cd5\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\uff08CSS\uff09\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\" data-show-lang=\"1\"><code>.sampleBackground {\n    height:  60%;\n    width:  90%;\n    background-image: url(sampleImage.jpg);\n    background-size: cover;\n\n    position: absolute;\n    left: 20px;\n    top: 20px;\n    z-index: -1;\n}\n\n.sampleBackground2 {\n    height: 100%;\n    width: 100%;\n    background-color: rgb(102 205 170 \/ .4);\n}\n\n.sampleText {\n    position: absolute;\n    font-size:  50px;\n    color:  rgb(255 255 255);\n    top: 10%;\n    left: 35%;\n    z-index:  99;   \n}<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u88c5\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<style>\n    .sample4 {\n        display: flex;\n        justify-content: center;\n        align-items: center;\n        height: 360px;\n        width: 50%;\n        margin: 0 auto;\n        position: relative;\n    }\n\n    .sampleBackground {\n        height: 90%;\n        width: 90%;\n        background-image: url(https:\/\/techmania.jp\/blog\/wp-content\/uploads\/2023\/07\/techmania.png);\n        background-size: contain;\n        background-repeat: no-repeat;\n        z-index: 1;\n        opacity: 0.6;\n    }\n\n    .sampleBackground2 {\n        height: 100%;\n        width: 100%;\n        background-color: rgb(102 205 170 \/ .4);\n        position: absolute;\n        top:0;\n        left:0;\n    }\n\n    .sampleText {\n        position: absolute;\n        font-size: 50px;\n        color: #000;\n        top: 10%;\n        left: 10%;\n        z-index: 99;\n    }\n<\/style>\n<div class=\"sample4\">\n    <div class=\"sampleBackground\">\n    <\/div>\n    <div class=\"sampleBackground2\">\n    <\/div>\n    <div class=\"sampleText\">\n        <p>sample<\/p>\n    <\/div>\n<\/div>\n\n\n\n<p>\u3069\u3061\u3089\u306e\u65b9\u6cd5\u3092\u63a1\u7528\u3059\u308b\u304b\u306f\u5b9f\u88c5\u3057\u305f\u3044\u5185\u5bb9\u3084\u30c7\u30b6\u30a4\u30f3\u306b\u3082\u3088\u308b\u305f\u3081\u3001\u4e21\u65b9\u899a\u3048\u3066\u4f7f\u3044\u5206\u3051\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u304a\u304f\u3068\u4fbf\u5229\u3067\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__4\" class=\"wp-block-heading\">\u307e\u3068\u3081<\/h2>\n\n\n\n<p>\u3044\u304b\u304c\u3067\u3057\u305f\u304b\uff1f\u4eca\u56de\u306f\u3001opacity\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<br>\u69d8\u3005\u306a\u5834\u9762\u3067\u4f7f\u3048\u308b\u4fbf\u5229\u306a\u6a5f\u80fd\u306a\u306e\u3067\u3001\u305c\u3072\u6d3b\u7528\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u306d\uff01<\/p>\n\n\n\n<h2 id=\"outline__5\" class=\"wp-block-heading\">HTML\/CSS\u306e\u5b66\u7fd2\u65b9\u6cd5\u306f\uff1f<\/h2>\n\n\n<p>\u66f8\u7c4d\u3084\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3067\u5b66\u7fd2\u3059\u308b\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002\u6628\u4eca\u3067\u306f\u3001YouTube\u306a\u3069\u306e\u52d5\u753b\u30b5\u30a4\u30c8\u3084\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u30b5\u30a4\u30c8\u306a\u3069\u3082\u5145\u5b9f\u3057\u3066\u3044\u3066\u591a\u304f\u306e\u60c5\u5831\u304c\u624b\u306b\u5165\u308a\u307e\u3059\u3002<br \/>\u305d\u3057\u3066\u3001\u3088\u308a\u52b9\u7387\u7684\u306b\u77e5\u8b58\u30fb\u30b9\u30ad\u30eb\u3092\u7fd2\u5f97\u3059\u308b\u306b\u306f\u3001\u77e5\u8b58\u3092\u3064\u3051\u306a\u304c\u3089\u5b9f\u969b\u306b\u624b\u3092\u52d5\u304b\u3057\u3066\u307f\u308b\u306a\u3069\u3001\u30a4\u30f3\u30d7\u30c3\u30c8\u3068\u30a2\u30a6\u30c8\u30d7\u30c3\u30c8\u3092\u7e70\u308a\u8fd4\u3057\u3066\u3044\u304f\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u7279\u306b\u72ec\u5b66\u306e\u5834\u5408\u306f\u3001\u6709\u8b58\u8005\u306b\u8cea\u554f\u304c\u3067\u304d\u305f\u308a\u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af\u3092\u3082\u3089\u3048\u308b\u3088\u3046\u306a\u74b0\u5883\u304c\u3042\u308b\u3068\u3001\u7406\u89e3\u5ea6\u304c\u6df1\u307e\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u305f\u3060\u3001HTML\/CSS\u306b\u9650\u3089\u305a\u3001IT\u30b9\u30ad\u30eb\u3092\u8eab\u306b\u3064\u3051\u308b\u969b\u3001\u3069\u3046\u3057\u3066\u3082\u8ab2\u984c\u306b\u3076\u3064\u304b\u3063\u3066\u3057\u307e\u3046\u3053\u3068\u306f\u3042\u308a\u307e\u3059\u3088\u306d\u3002\u7279\u306b\u72ec\u5b66\u3060\u3068\u3001\u308f\u304b\u3089\u306a\u3044\u90e8\u5206\u3092\u30d7\u30ed\u306b\u8cea\u554f\u3067\u304d\u308b\u6a5f\u4f1a\u3092\u78ba\u4fdd\u3057\u306b\u304f\u304f\u3001\u30e2\u30c1\u30d9\u30fc\u30b7\u30e7\u30f3\u304c\u7d9a\u304d\u306b\u304f\u3044\u3068\u3044\u3046\u5074\u9762\u304c\u3042\u308a\u307e\u3059\u3002\u72ec\u5b66\u3067\u30e2\u30c1\u30d9\u30fc\u30b7\u30e7\u30f3\u3092\u7dad\u6301\u3059\u308b\u81ea\u4fe1\u304c\u306a\u3044\u4eba\u306b\u306f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u3068\u3044\u3046\u624b\u3082\u3042\u308a\u307e\u3059\u3002\u8cbb\u7528\u306f\u639b\u304b\u308a\u307e\u3059\u304c\u3001\u305d\u306e\u5206\u30b9\u30ad\u30eb\u3092\u8eab\u306b\u3064\u3051\u3084\u3059\u3044\u3067\u3059\u3002\u3057\u3063\u304b\u308a\u3068\u77e5\u8b58\u30fb\u30b9\u30ad\u30eb\u3092\u7fd2\u5f97\u3057\u3066\u5b9f\u8df5\u306b\u6d3b\u304b\u3057\u305f\u3044\u3068\u3044\u3046\u4eba\u306f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u304c\u304a\u3059\u3059\u3081\u3067\u3059\u3002<\/p>\n<p><span class=\"markerYellow\"><strong>\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u306a\u3089\u30c6\u30c3\u30af\u30de\u30cb\u30a2\u304c\u304a\u3059\u3059\u3081\uff01<\/strong><\/span><\/p>\n\n\n<img decoding=\"async\" src=\"https:\/\/web-img.rensa.jp.net\/rensa\/images\/techmania\/thumbnail\/images\/yuudou.png\" class=\"post-img\">\n\n\n<p>IT\u30b9\u30ad\u30eb\u9700\u8981\u306e\u9ad8\u307e\u308a\u3068\u3068\u3082\u306b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u3082\u5897\u3048\u307e\u3057\u305f\u3002\u3057\u304b\u3057\u3001\u3069\u306e\u30b9\u30af\u30fc\u30eb\u306b\u901a\u3046\u3079\u304d\u304b\u8ff7\u3063\u3066\u3057\u307e\u3046\u4eba\u3082\u3044\u308b\u3067\u3057\u3087\u3046\u3002\u305d\u3093\u306a\u65b9\u306b\u306f\u30c6\u30c3\u30af\u30de\u30cb\u30a2\u3092\u304a\u3059\u3059\u3081\u3057\u307e\u3059\uff01\u3053\u308c\u307e\u3067\u591a\u304f\u306eIT\u30a8\u30f3\u30b8\u30cb\u30a2\u3092\u80b2\u6210\u30fb\u8f29\u51fa\u3057\u3066\u304d\u305f\u30c6\u30c3\u30af\u30de\u30cb\u30a2\u3067\u3082\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u3092\u958b\u8b1b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<div class=\"bgBox\">\n<p><strong>\uff1c\u30c6\u30c3\u30af\u30de\u30cb\u30a2\u306e\u7279\u5fb4\uff1e<\/strong><br \/><strong>\u30fb\u305f\u3057\u304b\u306a\u80b2\u6210\u5b9f\u7e3e\u3068\u89aa\u8eab\u306a\u6559\u80b2\u3000\uff5e\u30bb\u30ab\u30f3\u30c9\u30ad\u30e3\u30ea\u30a2\u3092\u5168\u529b\u652f\u63f4\uff5e<\/strong><br \/><strong>\u30fb\u8b1b\u5e2b\u304c\u73fe\u5f79\u30a8\u30f3\u30b8\u30cb\u30a2\u3000\uff5e\u201c\u672c\u5f53\u201d\u306e\u958b\u767a\u30ce\u30a6\u30cf\u30a6\u3092\u76f4\u306b\u5b66\u3079\u308b\uff5e<\/strong><br \/><strong>\u30fb\u5c02\u5c5e\u8b1b\u5e2b\u304c\u5b66\u7fd2\u3092\u5fb9\u5e95\u30b5\u30dd\u30fc\u30c8\u3000\uff5e\u300c\u308f\u304b\u3089\u306a\u3044\u300d\u3092\u5fb9\u5e95\u89e3\u6c7a\uff5e<\/strong><br 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[&hellip;]","protected":false},"author":11,"featured_media":9503,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"https:\/\/web-img.rensa.jp.net\/rensa\/images\/techmania\/thumbnail\/images\/css_opacity.webp","fifu_image_alt":"\u3010CSS\u5165\u9580\u3011opacity\u3067\u8981\u7d20\u3092\u900f\u660e\u306b\u3059\u308b\u65b9\u6cd5\u3068\u6d3b\u7528\u4f8b\u307e\u3068\u3081","footnotes":""},"categories":[15],"tags":[],"class_list":["post-9464","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-programming"],"_links":{"self":[{"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/posts\/9464","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/comments?post=9464"}],"version-history":[{"count":35,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/posts\/9464\/revisions"}],"predecessor-version":[{"id":9689,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/posts\/9464\/revisions\/9689"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/media\/9503"}],"wp:attachment":[{"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/media?parent=9464"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/categories?post=9464"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/techmania.jp\/blog\/wp-json\/wp\/v2\/tags?post=9464"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}