.woocommerce-js ul.products li.product .button {
  background-color: #000;
}

.woocommerce-js div.product form.cart .button.single_add_to_cart_button {
  background-color: #030303;
  color: #ffffff;
}

.product.woocommerce.add_to_cart_inline a.button {
  color: #000000;
  background-color: #000000;
}