alexplastik on "[Theme: Pinboard] Menus and mobile theme (header desappears when on)"

SOLUTION WAS :

First clear your background menu color in theme, then in layout, custom css add :

@media screen and (min-width: 760px) {
#access {
background: #123456;
}
}

Where : 123456 is the color you want to get for your theme!

Thanks to Andrew Nevins!