Electro - Add to Cart Button Custom Color

style.css

.owl-item>.product:not(:hover) .add-to-cart-wrap .button::before,
.owl-item>.product:not(:hover) .added_to_cart::before,
li.product:not(:hover) .add-to-cart-wrap .button::before,
li.product:not(:hover) .added_to_cart::before {
    background-color: #000;
}

.products.show-btn>li.product .added_to_cart:before,
.products.show-btn>li.product .button:before {
	background: 0 0;
}