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CSS3 color property

In CSS, color value can be specified using color names, hexadecimal code and RGB value. In addition, CSS3 introduce following types of color.
1. RGBA colors
2. HSL colors
3. HSLA colors
4. opacity

CSS3 RGBA Property

RGBA stands for red, green, blue, alpha. It is an extension of RGB color with an alpha channel. Alpha specifies the opacity of a color, its value can be given in between 0.0 (fully transparent) to 1.0 (full opaque).
Example: background-color using RGBA value


HSL Colors

HSL stands for Hue, Saturation and Lightness. Hue is a degree on the color wheel (from 0 to 360): 0 (or 360) is red, 120 is green, 240 is blue
Saturation is a percentage value: 100% is the full color.
Lightness is also a percentage; 0% is dark (black) and 100% is white.
Example: background-color using HSL value


HSLA Colors

HSLA color values are an extension of HSL color values with an alpha channel - which specifies the opacity for a color. The alpha parameter defines the opacity its value is in between 0.0 (fully transparent) and 1.0 (fully opaque).
Example: background-color using HSLA value

background-color: hsla(120, 100%, 75%, 0.3);
background-color: hsla(120, 100%, 50%, 0.3);
background-color: hsla(120, 100%, 25%, 0.3);

CSS3 Opacity

The CSS3 opacity property sets the opacity for a specified RGB value. Its value must be a between 0.0 (fully transparent) and 1.0 (fully opaque).
Example: CSS3 Opacity

Red - #p1 {background-color:rgb(255,0,0);opacity:0.6;} 
Green - #p2 {background-color:rgb(0,255,0);opacity:0.6;} 
Blue - #p3 {background-color:rgb(0,0,255);opacity:0.6;}