.qualityList{margin-bottom:66px; }
.qualityList ul{margin-left: -29px;}
.qualityList li{float: left;width:278px;height:402px;box-sizing:border-box;border: 1px solid #eee;border-radius: 6px;position:relative;margin-left: 29px;margin-bottom: 39px;}
.qualityList li img{display:block;width:100%;}
.qualityList li .shadow{position: absolute;left:0;}
@media (max-width: 1240px) {
    .qualityList ul{margin-left: -2.5%;}
    .qualityList li{width:22.5%;height:auto;margin-left: 2.5%;}
}
@media (max-width: 768px) {
    .qualityList li{width:30.83%}
}
@media (max-width: 480px) {
    .qualityList{margin-bottom:34px; }
    .qualityList ul{margin-left: -6.2%;}
    .qualityList li{width:43.8%;margin-left: 6.2%;margin-bottom: 20px;}
}