.site-item{
    width:24%;
    margin-left:1%;
    height:auto;
    float:left;
    <!--position:relative;-->
    margin:0px 10px 0 0;}


.site-item .intro {
    <!--position: absolute;-->
    top:80px;
    bottom: 0;
    height: auto;
    line-height: 28px;
    width: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    background: #fff;
    color: #000;
    font-size: 1.2rem;}

.site-item .last-child {
    margin-right: 0;}


.img img{width: 100%;height:auto;}