body{ margin:0; padding:0; font-size:30px; color:#fff}
.top{width:100%;height:100px;background-color:grey;}
.main{width:100%;height:500px;background-color:red;}
.left{ width:60%;height:500px;background-color:blue;float:left;}
.right{height:500px;background-color:green;float:right;width:36%;}
.foot{width:100%;height:50px;background-color:orange;clear both;}