Gird布局实战（圣杯布局）

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Gird布局实战（圣杯布局）</title>
</head>
<body>
    <header>页眉</header>
    <aside>左侧</aside>
    <main>主体</main>
    <aside>右侧</aside>
    <footer>页脚</footer>
    <style>
        *{
            padding:0;
            margin:0;
            box-sizing: border-box;
        }
        body *{
            background-color: lightgreen;
        }
        body {
            display: grid;
            /* 3行3列 */
            /* minmax(400px,1fr) 中间响应式，两边固定 */
            grid-template-columns: 200px minmax(400px,1fr) 200px;
            /* minmax(clac(100vh - 6em - 0.6em),1fr)  */
            grid-template-rows: 3em minmax(calc(100vh - 6em - 0.6em),1fr) 3em;
            gap: 0.3em;
            place-content: center;
        }
       header,
       footer{
           grid-column: span 3;
       }
    </style>
</body>
</html>
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