三列布局-左右绝对定位-中间适应

基本思路:

1. 左右2列采用绝对定位来布局
2. 中间内容部分采用margin挤压出来

HTML结构

<div class="container">
<div class="left">左侧</div>
<div class="right">右侧</div>
<div class="main">主体</div>
</div>

CSS样式

<style type="text/css">
.container{
position: absolute;
left: 0;
right: 0;
}
.left{
top: 0;
left: 0;
position: absolute;
width: 200px;
height: 600px;
background-color: aqua;
}
.right{
top: 0;
right: 0;
position: absolute;
width: 200px;
height: 600px;
background-color: yellowgreen;
}
.main{
margin-left: 200px;
margin-right: 200px;
height: 600px;
background-color: papayawhip;
}
</style>