Add extra class in Woocommerce-info so I can hide Coupon section

Hi,

I have this website where I am using woocommerce. https://fridaymascara.com/kopen/extreme-volume-mascara/

We are also selling Giftcard where it doesn't make sense to show coupon section.
Usually i can easily hide them using CSS with display:none and PHP if products are giftcard hide woocommerce-info.

The problem is both "returning client login" and "Coupon" section are under the same class "woocommerce-info" div.

how can I add extra class in the coupon section so i can individually target them in css?
Or perhaps there is another solution.