Need help with Mobile Menu

When choose to use a custom menu such as change link color size etc, when it goes to mobile menu the background color is gone . I have tried everything tho change this to a solid background but nothing works. Menu looks great until it goes to mobile. The mobile menu drops down over a photo and you cannot see the text. Is there a way to edit the menu without losing the background color , i have tried different classes but I’m not seeing a result

If you give it a class than you can make changes in that class for mobile or tablet.
You will need to open it in the specific view to make changes in that class.

Did you try using the special subclass?
May want to check out this video: