[Support request] background on mobile menu

I know this should be easy to solve, but I have been working on this for several days. My mobile menu on my site has a dark background even when I go in and change the color. The menu items do not show since the text is the same color as the background. I want white background and black text, but whatever changes I make don’t seem to work. If I scroll over the mobile menu, then the individual items do show, but I want them all to show. I am using GP Premium, latest version. Like I said, probably some simple mistake in the customizer but nothing I try seems to work.