Yelp

(The Help System)

color.bg.dark

A dark gray background color.

This parameter specifies a shade of gray that is suitable for backgrounds, and is darker than color.bg.gray. It should have a high color contrast against color.fg. It is typically used at the intersection of shaded rows and columns in a table, or as a very light gray accent color. If not specified, it can be automatically computed based on color.gray and color.bg.