*{margin:0;padding:0}
ul,li{list-style:none}
ul{overflow: hidden;margin:50px auto;width:700px}
ul li{float:left;width:150px;height:150px;border:1px solid #ddd;margin-left:10px;position: relative;}
ul li div{position: absolute;margin:auto;left:0;top:0;right:0;bottom:0}