Spent all night trying to find this. This seemed to work for me. Posted here for others:
.woocommerce .products .product,
.woocommerce-page .products .product {
min-height: 450px;
max-height: 450px;
display: inline-block;
vertical-align: top;
}
.woocommerce .products .product,
.woocommerce .products .product .price
{text-align:center}
