.body{width:100%;margin:auto;padding:auto;height:100%}.main{float:left}.main,.main1{width:48%;padding-top:10px;height:400px;position:relative;margin:auto}.main1{float:right}.main2{float:right}.main2,.main3{padding-top:10px;width:48%;height:400px;position:relative;margin:auto}.main3{float:left}