一、左右侧固定，中间自适应布局
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
*{
margin: 0;
padding: 0;
}
.clearfix:after{
content: "";
display: block;
clear: both;
}
.clearfix{
zoom: 1;
}
.left{
position: absolute;
top:0px;
left: 0px;
200px;
height: 1000px;
background-color: #1D71B6;
}
.right{
position: absolute;
top:0px;
right: 0px;
300px;
height: 1000px;
background-color: #000000;
}
.main{
margin:0 310px 0 210px;
height: 1000px;
background-color: #BBBBBB;
}
</style>
</head>
<body>
<div id="contain" class="clearfix">
<div class="left">
</div>
<div class="main">
</div>
<div class="right">
</div>
</div>
</body>
</html>
二。 左侧固定，右侧自适应布局
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<style type="text/css">
.left{
float: left; /*或者是 position: absolute;*/
50px;
height: 80px;
background: #BBBBBB;
}
.main{
margin-left:50px;
height: 80px;
background-color: #1D71B6;
}
</style>
<body>
<div id="contain">
<div class="left">
</div>
<div class="main">
</div>
</div>
</body>
</html>