.ll li{
      width: 23%;
      float: left;
      margin: 0px 1%;
      height: 220px;}

.ll div{
    width: 100%;
    height: 160px;
    text-align: center;    
    line-height: 156px;
    background-color: #f5f5f5;}
.ll div img{
    max-width: 100%;
    max-height: 160px;
    vertical-align: middle;}