.content {
    padding: 20px;
    margin-top: 20px;
    background: #fff;
}
.ztlist li{
    width: 32%;
    height: 106px;
    float: left;
    margin-right: 2%;
    margin-bottom: 15px;
    
}
.ztlist li img{
    display: block;
    width: 100%;
    height: 100%;
}
.ztlist {
    padding-bottom: 10px;
}
@media (max-width: 767px) {

.ztlist li{
    width: 100%;
    margin-right: 0;
}
}