@media screen and (max-width: 480px) {
  #qty, .variation-product-detail-info, #subtotal {
  	margin-top: 20px;
  }
  .variation-product-detail-info {
  	position: unset;
  }
  .product-details-box .product-actions .addtocart, .product-details-box .product-actions .buynow {
  	width: 100% !important;
  	margin-bottom: 10px;
  }
}