.common-main .pro-cate li{width:32%;margin-bottom:2%;margin-right:2%}
.common-main .pro-cate li:nth-child(4n){margin-right:2%}
.common-main .pro-cate li:nth-child(3n){margin-right:0}
@media (max-width:900px){.common-main .pro-cate li{width:100%;margin-right:0 !important;margin-bottom:3%}}