我设定的main有什么问题啊 怎么和效果图不一样
.left{ width:100px; height:600px; background:#ccc; position:absolute; left:0; top:0}
.main{ height:600px; margin:0 50px 0 50px; background:#9CF}
.right{ height:600px; width:150px; position:absolute; top:0; right:0; background:#FCC;}
