Colors in CSS
are most often specified by: Valid color name - eg "green" RGB value - eg "rgb(155, 100, 50)" HEX value - eg "#550a90" Note: Color names are case-insensitive: "Red" is the same as "red" or "RED". HTML and CSS supports 140 standard color names. RGB (Red, Green, Blue) RGB color values can be specified using this formula: rgb(red, green, blue) colors