.pdp-single .product-variants {
  margin-bottom: 0;
}

.product-description {
  margin-top: 18px;
}

@media only screen and (min-width: 992px){
  .pdp-single .product-variants {
    margin-bottom: 1.688rem;
  }
  
  .product-description {
    margin-top: 0;
  }
}