1 <!DOCTYPE html>
2 <html lang="en">
3 <head>
4 <meta charset="UTF-8">
5 <meta name="viewport" content="width=device-width, initial-scale=1.0">
6 <meta http-equiv="X-UA-Compatible" content="ie=edge">
7 <title>Document</title>
8 <style>
9 body, h1{padding: 0;margin: 0;}
10 header{width: 100%;height: 100px;background-color: green;}
11 footer{width: 100%; height: 100px;background-color: darkslategray;}
12 .left,.right,.center{float: left; height: 500px;}
13 .left,.right{ position: relative; width: 200px;}
14 .container{
15 overflow: hidden;
16 padding: 0 200px;
17 }
18 .center{
19 background-color: greenyellow;
20 width: 100%;
21 }
22 .right{
23 background-color: #3a9;
24 right: -200px;
25 margin-left: -200px;
26 }
27 .left{
28 background-color: #f00;
29 left: -200px;
30 margin-left: -100%;
31 }
32 </style>
33 </head>
34 <body>
35 <header><h1>header</h1></header>
36 <div class="container">
37 <div class="center">center</div>
38 <div class="left">left</div>
39 <div class="right">right</div>
40 </div>
41 <footer><h1>footer</h1></footer>
42 </body>
43 </html>
