1 <!DOCTYPE html>
2 <html lang="en" style="font-size: 20px">
3 <!-- style="font-size: 20px" 设置1rem单位为20px -->
4 <head>
5 <meta charset="UTF-8" >
6 <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
7 <title>Document</title>
8 <style type="text/css">
9 body{
10 margin: 0
11 }
12 .box1{
13 font-size: 16px;
14 width: 20rem;
15 height: 10rem;
16 background-color: gold;
17 /* 宽等于20*20 高等于10*20 */
18 }
19 </style>
20 </head>
21 <body>
22 <div class="box1">1</div>
23 <div class="box2"></div>
24 </body>
25 </html>
