niche: Add a loading animation when adding item to cart

Hi!

I'm not sure this forum is the right place since I don't know if it's a niche/generatepress thing or more on the booking plugin side, apologies in advance!

I'm using WooCommerce Booking on my website along with niche/generatepress theme.

I want to add the spinner loading animation when customer click on the "RÉSERVER" button because it takes some time and I wand to user to know that it's indeede working in the bg...

Website: https://splitboardqc.ca/p/marauder-splitboard-147/

Thanks!