Peter's HTML Colour Reference

VGA Colour Set The standard 16 colours.
Browser Safe Colours Page 1 By increasing green.
Browser Safe Colours Page 2 By increasing red.
Named Colours Page 1 140 in alphabetical order.
Named Colours Page 2 Arranged by colour.
Named Colours Page 3 Named colour variants.
Grays Shades of black and white.
System Colours You can even use them in webpages.

There are two ways to specify a colour in HTML code:

Give its RGB (red-green-blue) value
<body bgcolor="#CC33FF">

Use a colour name
<font color="aqua">

If a colour is specified by its red-green-blue components, each of these can have an intensity from 0 to 255. This means that there are 16,777,216 possible colours (256³). Hexadecimal numbers are convenient for specifying colour components, because the 0–255 range in decimal becomes 00–FF in hexadecimal, requiring only two digits. Black is #000000 and #FFFFFF is white.