CSS Colors

Education is not limited to just classrooms. It can be gained anytime, anywhere... - Ravi Ranjan (M.Tech-NIT)

Colors in CSS are most often specified by:

  • a valid color name - like "red"
  • an RGB value - like "rgb(255, 0, 0)"
  • a HEX value - like "#ff0000"

Color Names

Colors set by using color names:

Example

Color Name
  Red
  Green
  Blue
  Orange
  Yellow
  Cyan
  Black

RGB (Red, Green, Blue)

RGB color values can be specified using this formula: rgb(red, green, blue).

Each parameter (red, green, blue) defines the intensity of the color between 0 and 255.

For example, rgb(255,0,0) is displayed as red, because red is set to its highest value (255) and the others are set to 0. Experiment by mixing the RGB values below:

Red Green Blue
255 0 0
     
 
rgb(255, 0, 0)

Example

Color RGB
  rgb(255,0,0)
  rgb(0,255,0)
  rgb(0,0,255)
  rgb(255,165,0)
  rgb(255,255,0)
  rgb(0,255,255)

 

Shades of grey are often defined using equal values for all the 3 light sources:

Example

Color RGB
  rgb(0,0,0)
  rgb(128,128,128)
  rgb(255,255,255)

Hexadecimal Colors

RGB values can also be specified using hexadecimal color values in the form: #RRGGBB, where RR (red), GG (green) and BB (blue) are hexadecimal values between 00 and FF (same as decimal 0-255).

For example, #FF0000 is displayed as red, because red is set to its highest value (FF) and the others are set to the lowest value (00). Note: HEX values are case-insensitive: "#ff0000" is the same as "FF0000".

Example

Color HEX
  #FF0000
  #00FF00
  #0000FF
  #FFA500
  #FFFF00
  #00FFFF

Shades of grey are often defined using equal values for all the 3 light sources:

Example

Color HEX
  #000000
  #808080
  #FFFFFF