.top{height:100px;background:#ccc;margin:0 auto}
.main{height:600px;background:red;position:relative}
.left{
height: 600px;
width:200px;
background: blue;
positive:absolute;top:0;left:0}
.right{
height: 600px;
width:100%;
background: green;
position:absolute;
margin-left:210px;
}
.foot{height:50px;background:#F63;}
echo_kinchao
渊翼