The GP Premium support forum is to provide support for GP Theme and the GP Premium Plugin.
Yes, we do got outside of this scope for all of our users with the provision of custom code etc like in the instance i provided you the CSS you require to makes the classes work.
I am sure if you asked another Theme developer for support when you’re not using their theme you would not receive the same resposne.
So the one fundamental requirement of our support is that your site is using GenereatePress.