[GrannyGrump]

If you are planning to use this css for books to re-distribute, most folks will also tell you not to set a font color, or at least to be very judicious with your colors. If you set it to black, and the user wants to read white text on a black background, s/he will be out of luck for those specific words. Better to use color: inherit for things like links (if you want to kill the blue). You will probably get away with different tones of gray, but black and white are treacherous.

Of course, if this is only for your own use, you only have to please your own eyes.

A nice concept for experimentation! I will do some checking when I get home.