How To Change Shopping Cart Estimate Shipping CSS

.shopping-cart-page .common-buttons .estimate-shipping-button {
  display: inline-block;
  min-width: 180px;
  margin: 5px;
  border: none;
  background-color: #aaa;
  padding: 10px 20px;
  font-size: 15px;
  text-align: center;
  color: #fff;
}

.shopping-cart-page .common-buttons .estimate-shipping-button:hover,
.shopping-cart-page .common-buttons .estimate-shipping-button:focus {
  background-color: #999;
}