1 <!DOCTYPE html>
2 <html lang="en">
3
4 <head>
5 <meta charset="UTF-8">
6 <meta name="viewport" content="width=device-width,initial-scale=1 user-scalable=0">
7 <title>Document</title>
8 <style>
9 /*
10
11 要想设置当前容器的高度或宽度百分比，必须“明确”知道父容器的高度或宽度
12 */
13
14 * {
15 padding: 0;
16 margin: 0;
17 }
18
19 .one {
20 width: 20%;
21 height: 100px;
22 float: left;
23 background: red;
24 }
25
26 .two {
27 width: 30%;
28 float: left;
29 background: blue;
30 }
31
32 .three {
33 width: 50%;
34 height: 100px;
35 float: left;
36 background: green;
37 }
38
39 .four {
40 width: 50%;
41 height: 50%;
42 background: #fff;
43 }
44 </style>
45 </head>
46
47 <body>
48 <div class="one"></div>
49 <div class="two"></div>
50 <div class="three">
51 <div class="four"></div>
52 </div>
53
54 </body>
55
56 </html>
