.inner_s2 li .pic{
    padding-top: 71%;}
.inner_s2 li{
    position: relative;
    width: 31.33%;
    margin: .38rem 0 0 3%;
    background: #FFFFFF;
    box-shadow: 0 0 .23rem 0 rgba(0, 0, 0, 0.1);}
.inner_s2 li:nth-child(-n+4){
    margin-top: 3.01%;}
.inner_s2 li:nth-child(4n+1){
    margin-left: 3.01%;}
.inner_s2 li:nth-child(-n+3){
    margin-top: 0;}
.inner_s2 li:nth-child(3n+1){
    margin-left: 0;}
@media (max-width: 768px){
    .inner_s2 li{
        width: 48% !important;
        float:left;margin:0;}
   .inner_s2 li:nth-child(-n+4){
    margin-top: 0%;}
.inner_s2 li:nth-child(4n+1){
    margin-left: 0%;}

}
@media (max-width: 481px){
    .inner_s2 li{
        width: 100% !important;}
}