@media only screen and (max-width: 767px) {
  .woocommerce ul.products, 
  ul.products {
    display: flex !important;
    flex-wrap: wrap !important;
  }
  .woocommerce ul.products li.product, 
  ul.products li.product {
    width: 50% !important;
    max-width: 50% !important;
    flex: 0 0 50% !important;
    padding: 5px !important;
    box-sizing: border-box !important;
  }
}