*{margin: 0;padding: 0}
ul{list-style: none}
.box ul li{display: block;float: left;width: 300px;height: 300px;margin-right: -1px;background-size: cover;background-position: center center;}
.box{height: 300px;width:3010px;}
#box1,#box2{float: left}
.wrap{position: relative;width: 800px;margin: auto;height: 300px;overflow: hidden}
.box{position: absolute;left: 0;}