Change the background colour of the navigation bar

Hey there,

I’ve been trying to change the background colour of the navigation bar in the ‘customizing colour’ as well as the ‘additional CSS’ section, but so far without success. I have installed the Max Mega Menu plugin, which also has a custom CSS section, but the result is the same. I also have to add that I have very limited knowledge of CSS, so if anyone has any ideas, I’d be very grateful if you could share them!

I would like to have the background turn rgb(190, 182, 182) / #BEB6B6 instead of white when scrolling down.

Thanks a lot in advance!

Magdi