216 Web Safe Colors
Web-safe colors which including 216 colors can properly display color palette on different hardware environment, different operating systems or different browsers. So the 216 web-safe colors can avoid distortion of the original color. However, one shortcoming of the web-safe palette is its poor selection of light background colors.
The following table shows all of the web safe colors, underlining the really-safe colors. including color codes for hexadecimal and rgb color values.