These are the 216 browser safe colors that look
equally good on both PC and Mac operating systems and the
Microsoft and Netscape browsers. Use another color and the
browser will try to create the color by combining (dithering)
a number of the 216 acceptable colors. The resulting color
could be slightly different to the color you had intended.
Stick to these 216 colors and you will be sure that the resulting
color is what you intended.