.pic-box{position:relative;padding-top:115%;overflow:hidden;}
.pic-bg{position:absolute;width:100%;height:100%;top:0;right:0;left:0;bottom:0;transition:all .3s;}
.pic-box:hover .pic-bg{transform:scale(1.1);}
.img-listssz ul li{
width:21%;
box-sizing: border-box;}
@media screen and (max-width: 1024px) {
 .img-listssz ul li{
margin:20px 2%;}  
}

@media screen and (max-width: 480px) {
 .img-listssz ul li{
 width:46%;
margin:20px 2%;}  
}