求解,为什么right无法自适应宽度
.top{height:100%;margin:auto;background:#ccc;}
.main{height:800px;width:100%;background:red;}
.left{width:200px;height:800px;background:blue;position:absolute;left:0;}
.right{height:800px;background:green;margin-left:210px;float:left;}
.foot{height:100px;clear:both;background:orange;}