/**组件**/
.pic-img{
    position:relative;
   padding-top:78%;}
.pic-img img {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;}
.sec22-list .ban2 ul li{width:18%;float:left;margin-right:2.5%;}
.sec22-list .ban2 ul li.last{margin-right:0;}
.sec22-list .ban2 ul{}