Menu colours for Mobile

I have the Kleo theme and i am having trouble with the menu colours for the mobile version of the site.

I've added some custom CSS which has helped but i am struggling with one final part.

If you look at the 2 attached screenshots from my phone, the homepage on mobile has a different colour scheme to the other pages - the header has a black background and white text. On the menu items that have tabbed content under them you can see the toggle you touch to lower that part of the menu.

On the other pages the background is white - when you touch the lines to navigate the site the menu items with tabbed content underneath must have a white toggle button as it can't be seen against the white background and so you wouldn't know it was there. How can i make that toggle option a different colour on those pages so you can see it? Any ideas?