.woocommerce ul.products li.product a{
    display: block;
}

.woocommerce ul.products li.product a img{
    max-height: 225px;
    width: auto;
    margin: 0 auto;
}

.woocommerce div.product div.images img{
    max-height: 600px;
    width: auto;
    margin: 0 auto;  
}