Submenu background color on mobile

Hello

I’m very happy for Sydney pro it’s a super theme.
I’m trying to do my mobile submenu lookalike my desk top site _and wonder how to do the submenu background transparent, have the lines between text whiter, and the hover on submenu text red.

I tried _ and can change the color on submenu background but not to transparent – If I write transparent it changes to a sort of dark grey.

Kind Regards

Peter

Hello

I solved by finding on the net some code Kharis wrote.

Kind regards Peter