CSS3 Color Values

Color Value	Description and Notes
rgb(red-value, green-value, blue-value)	RGB (red, green, blue) color model values can be a number from 0 to 255 or a percentage (but not a combination of numbers and percentages) rgb(0, 0, 0) and rgb(0%, 0%, 0%) are black rgb(255, 255, 255) and rgb(100%, 100%, 100%) are white
rgba(red-value, green-value,  blue-value, alpha)	RGB color model, plus alpha transparency color values are the same as for RGB syntax the fourth parameter, alpha, is a decimal greater than or equal to 0.0 (full transparency) and less than or equal to 1.0 (full opacity)
hsl(hue-value, saturation-value, lightness-value)	HSL (hue, saturation, lightness) color model the hue value is expressed as the angle of a color circle (a number from 0 to 360); 0 and 360 = red, 120 = green, 240 = blue, with other colors represented in between the saturation value is expressed as a percentage; 0% is gray, and 100% is full saturation of the color the lightness value is expressed as a percentage; 0% is black, 100% is white, and 50% is "normal"
hsla(hue-value, saturation-value, lightness-value,alpha)	HSL color model, plus alpha transparency color values are the same as for HSL syntax the fourth parameter, alpha, is a decimal greater than or equal to 0.0 (full transparency) and less than or equal to 1.0 (full opacity)