@media screen and (max-width: 767px) {
  .product-purchase #product-hero {
    margin-bottom: 20px; }
  .product-purchase .option, .product-purchase .upgrade, .product-purchase .shipping-option {
    width: 100% !important;
    margin: 0 0 20px !important;
    float: none; }
  .product-purchase #add-to-cart-area .detail-block#contact-details {
    margin-right: 20px; } }