Change Compare At Price Colour and Design in Shopify

Paste this at the end of base.css in shopify code

/* Change compare-at price color to grey and reduce font size */

s.price-item.price-item–regular,

.price__sale .price-item–regular,

.compare-at-price {

  color: #707070 !important;

  font-size: 0.6em !important;

  font-weight: normal;

  text-decoration: line-through;

}