CSS:圣杯布局例子-复习

<!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>盒模型</title>
</head>
<body>
    <header>header</header>
    <aside calss="letf">left</aside>
    <main>main</main>
    <aside calss="right">right</aside>
    <footer>footer</footer>    
<style>
    *{
        padding: 0;
        margin: 0;
        box-sizing: border-box;
    }
    body {
        display: grid;
        grid-template-rows: 2em minmax(20em,30em) 2em;
        grid-template-columns: 6em 1fr 6em;
    }
    header,footer{
        background-color: yellow;
        grid-column: span 3;
    }
    main{
        background-color: cyan;
    }
    aside {
        background-color: lightblue;
    }    
    main{
        background-color: green;
    }
    /* rem+vw进行布局，移动端不运行出现px,有px to rem的插件 */
</style>
</body>
</html>
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