/**组件**/
.nav div{border-radius: 20px;}
.fg-list-img{    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;}
.img-lists ul li{    width: 22%;
    margin-left: 4%;}
.img-lists ul li:nth-child(4n+1) {
    margin-left: 0;}