body{ margin:0; padding:0; font-size:30px; color:#fff} .top{height:100px; background:#999;} .main{height:600px; background:#F00;} .left{height:600px; background:#00F; float:left; width:30%;} .right{height:600px; background:#0C0; float:right; width:69%;} .foot{height:50px; background:#F90;} 这样可以吗