ul, li{margin:0px;padding:0px;float:left;list-style-type:none;}
/* box */
#box {height:502px;border-left:1px solid #fff;margin:0px auto;}
#box li.snone{width:21px;height:502px;overflow:hidden;position:relative;}
#box li.shove{width:21px;text-align:right;}
#box li span.snone{width:20px;height:512px;top:0px;left:0px;color:#fff;cursor:pointer;text-align:center;padding:135px 0 0 0;background:#949393;position:absolute;border-right:2px solid #fff;}
#box li span.shove{width:20px;height:512px;top:0px;left:0px;color:#fff;cursor:pointer;text-align:center;padding:135px 0 0 0;background:#949393;position:absolute;border-right:2px solid #fff;}