Learn About HTML Colors

Color Values 

Colors are defined using a hexadecimal notation for the combination of
 red, green, and blue color values (RGB).
The lowest value that can be given to one light source is 0 (hex #00). The highest value is 255 (hex #FF). This table shows the result of combining red, green, and blue:
Color Color HEX Color RGB  #000000  rgb(0,0,0)    #FF0000  rgb(255,0,0)     #00FF00 rgb(0,255,0)    #0000FF  rgb(0,0,255)     #FFFF00  rgb(255,255,0)    #00FFFF  rgb(0,255,255)     #FF00FF  rgb(255,0,255)     #C0C0C0 rgb(192,192,192)    #FFFFFF  rgb(255,255,255)
Color Names A collection of color names is supported by most browsers. To view a table of color names that are supported by most browsers visit this web page:
http://profdevtrain.austincc.edu/html/color_names.htm
Note: Only 16 color names are supported by the W3C HTML 4.0 standard (aqua, black, blue, fuchsia, gray, green, lime, maroon, navy, olive, purple, red, silver, teal, white, and yellow). For all other colors you should use the Color HEX value. 
Color Color HEX Color Name  #F0F8FF AliceBlue   #FAEBD7  AntiqueWhite     #7FFFD4  Aquamarine     #000000  Black     #0000FF Blue     #8A2BE2  BlueViolet     #A52A2A  Brown
Web Safe Colors A few years ago, when most computers supported only 256 different colors, a list of 216 Web Safe Colors was suggested as a Web standard. The reason for this was that the Microsoft and Mac operating system used 40 different "reserved" fixed system colors (about 20 each). This 216 cross platform web safe color palette was originally created to ensure that all computers would display all colors correctly when running a 256 color palette. To view the 216 Cross Platform Colors visit this web page: http://profdevtrain.austincc.edu/html/216.html  
16 Million Different Colors The combination of Red, Green and Blue values from 0 to 255 gives a total of more than 16 million different colors to play with (256 x 256 x 256). Most modern monitors are capable of displaying at least 16,384 different colors. To assist you in using color schemes, check out http://wellstyled.com/tools/colorscheme2/index-en.html. This site lets you test different color schemes for page backgrounds, text and links.