CSS:盒模型-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>
    <!-- <div class="box"> -->
    <div class="box1">
    </div>
    <style>
        .box {
            /* em绑定当年或父级的font-size */
            /* width: 160px; */
            font-size: 10px;
            width: 10em;
            height: 150px;
            border: 3px solid red;
            box-sizing: border-box;
        }
        .box2{
            /* rem永远和html中的fontsize绑定 */
            font-size: 10px;
            width: 10rem;
            height: 150px;
            border: 3px solid red;
            box-sizing: border-box;
        }
        .box1{
            /* vh,vm */
            /* vm可视窗口宽度的1%， vh可视窗口的高度的1% */
            width: 50vw;
            height: 30vh;
            background-color: red;
        }
    </style>
</body>
</html>
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