Add icon to add to cart button - DAWN

[PyroProducts]

I have uploaded the white PNG image to shopify, put the link in the code. But on my store it is showing in black? Tobaliq Black Turbo Aansteker - PyroProducts And can you also please tell what code to add to center the text with icon on mobile. (see picture)

button.product-form__submit.button.button--full-width.button--primary > span {
position: relative;
}

button.product-form__submit.button.button--full-width.button--primary > span::before {
position: absolute;
background: url(https://cdn.shopify.com/s/files/1/0595/0285/4318/files/cart-plus-svgrepo-com.png?v=1716988315) no-repeat;
background-size: cover;
width: 25px;
height: 25px;
content: "";
left: -30px;
top: -3px;
filter: invert(1);
}