.szdw li {
    float: left;
    width: 21%;
    margin: 0 2%;}
.clear{    clear: both;}
.pic-img {
    padding-top: 140%;
    position: relative;}
.pic-img img {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;}
.szdw li p {
    text-align: center;
    font-size: 16px;
    line-height: 50px;}