Change woocommerce button colour in Twenty Seventeen

Hi, hope someone can help.

I’d like to change to colour of the Woocommerce buttons in Twenty Seventeen. I found a thead about the (check out) add to cart buttons and that worked. I also wanted to change the ones at the front of the store, can’t make that work. This is what I did:
button_product_type_simple add_to_cart_button_ajax_add_to_cart {background-color: #7D0552 !important;
}
(Taken from source, tried without underscore here and there (weren’t in source) and with, doesn’t make a difference though.)

The page I need help with: [log in to see the link]