Color Scheme Designer 3. HTML color codes. HTML color codes are hexadecimal triplets representing the colors red, green, and blue (#RRGGBB).
For example, in the color red, the color code is #FF0000, which is '255' red, '0' green, and '0' blue. These color codes can be used to change the color of the background, text, and tables on a web page. Major hexadecimal color codes.