How to change background colour on top menu and text block

[T-bird]

I've just migrated to PS version 8.2.0 and for the most part I've got everything looking like I want, but I'm damned if I can figure out how to change the background colour of the top menu:

and text block:

I've searched everywhere in themes/classic/assets/css/theme.css and found all the other colours I wanted to change but I just cannot find the styles controlling the background colour of these two items. Can anyone point me in the right direction please? Is there another style sheet somewhere that I haven't found?

Edited 2 hours ago by T-bird (see edit history)