ul.product-cats li {
    list-style: none;
    margin-left: 0;
    margin-bottom: 2em;
    text-align: center;
    position: relative;
}
ul.product-cats li img {
    margin: 0 auto; 
}
    ul.product-cats li {
        width: 47%;
        float: left;
        margin-right: 2%;
    }
    ul.product-cats li:nth-of-type(2) {
        margin-right: 2%;
    }
 
@media screen and (min-width:768px) {
 
    ul.product-cats {
        margin-left: 0;
        clear: both;
    }
    ul.product-cats li {
        width: 18%;
        float: left;
        margin-right: 2%;
    }
    ul.product-cats li:nth-of-type(5) {
        margin-right: 2%;
    }
     
}