[Theme: The Retailer] Change color of simple add to cart button

Hi,

I’m trying to change the color of the simple add to cart buttons on this page: https://sanwinbeachwear.com/heren-armband/

I tried all sorts of css classes in my childtheme css but can’t seem to find the right one these are the things I already tried but didn’t work:

.add_to_cart_button.product_type_simple, add_to_cart_button.product_type_simple, button.add_to_cart_button.product_type_simple, .button.add_to_cart_button.product_type_simple {
    background-color: #20bd41 !important;
}

Hope there is someone who can help me out.

Cheers,

Sander