Cannot read all of the offline help pages due to theme colors

I’ve installed the “offline” help package. The theme/format of the pages is such that about the top color band obscured most of the screen. Only the bottom third is readable. There is a help index in the color band that I can use my mouse to swipe. I made a screen shot but can’t find a way to attach or include here.

I’m on windows 10 using Firefox and Edge browsers.

On Firefox press Ctrl+0 (Ctrl+zero) to set view to 100%