Ok, I'll post the hexdec version, but it's easy to translate to rgb() if you need:

The default colors

bg: #141414 (apply this bg also on the characters that do borders)

fg: #c6c6c6 (most of foreground text, unless highlighted)

Line highlight bg: #1b1b1b (this can also be applied to the header)

Line highlight fg: #ffffff

The main fg color to highlight actions: I like this orange-yellow: #ffaf00

Style borders separately

border bg: #141414 (match overall bg)

border fg: #444444

border font fg: #666666 (I like this actually somewhat faded, you could even keep it at #444444)

You can also do round corners for borders

lefttop = ╭

righttop = ╮

leftbottom = ╰

rightbottom = ╯

topmiddle = ┬

bottommiddle = ┴

leftmiddle = ├

rightmiddle = ┤

cross = ┼