ul.product-cats li {
    list-style: none;
    margin-left: 0;
    margin-bottom: 4.236em;
    text-align: center;
    position: relative;
}
ul.product-cats li img {
    margin: 0 auto;
}

@media screen and (min-width:768px) {

    ul.product-cats {
        margin-left: 0;
        clear: both;
    }
    ul.product-cats li {
        width: 29.4117647059%;
        float: left;
        margin-right: 5.8823529412%;
    }
    ul.product-cats li:nth-of-type(3) {
        margin-right: 0;
    }

}