I am still confused. Any background color, other than black risks it being illegible to anyone who may have a problem with seeing colors. For instance, if the text is green and the background is yellow, I would not be able to see the text at all.
Black is the only color which allows all text to be visible, regardless of any ability to see color the player may have.
By the way, if you force anistropic filtering on, it will blur the text in the game. If you force anti-aliasing on, it could blur text in the game.