in my header menu when I add a page and a submenu, the submenu text is inside a coloured box. I know where to change the color of that box, however ideally I would like this to be transparent, so only the text of the submenu items appears.
I guess i would need some additional CSS? If so, how would that need to look like?
Generally, leaving the background color field empty in the theme options disables that specific background.
Bravada uses the same background color for the submenus as the side menu, so if you want to customize the submenus independently you’ll need to use CSS:
body #access ul.sub-menu li a, body #access ul.children li a {
background-color: transparent;
}