ul.product_list .pl_manufacturer { height:50px; line-height:50px; position:relative; }
ul.product_list .pl_manufacturer a { bottom:0; display:block; text-align:center; width:100%; }
ul.product_list .pl_manufacturer a img { display:inline-block; height:50px; }

@media (max-width: 480px) {
    ul.product_list .pl_manufacturer { height:40px; line-height:40px; position:relative; }
    ul.product_list .pl_manufacturer a img { display:inline-block; height:40px; }
}