.woocommerce-product-details__short-description,
.variations {
position: relative;
}
.woocommerce-product-details__short-description::after,
.variations:after {
  background: #dedede none repeat scroll 0 0;
  content: ".";
  height: 1px;
  left: 0;
  position: absolute;
  bottom: -10px;
  width: 100%;
}