Cascading style sheets (CSS) support the color names and values listed above and also offer a number of other formats not available in HTML.
Under CSS, color values can be defined using three-digit hexadecimal color values, a concise version of the six-digit values just noted. This approach is supported by Internet Explorer 3 and higher and Netscape Navigator 4 and higher.
span {font-family: Helvetica; font-size: 14pt; color: #0CF;}
Under CSS, color values can be defined using RGB values. Colors are defined by the letters rgb, followed by three numbers between 0 and 255 that are contained in parentheses, separated by commas, and with no spaces between them. This approach is supported by Internet Explorer 4 and higher and Netscape Navigator 4 and higher.
p {color: rgb(204,0,51);}
Under CSS, RGB color values can also be defined using percentages. The format is the same, except that the numbers are replaced by percentage values between 0% and 100%. This approach is supported by Internet Explorer 4 and higher and Netscape Navigator 4 and higher.
p {color: rgb(75%,10%,50%);}