CSS3 Colors
CSS supports color names, hexadecimal and RGB colors.
In addition, CSS3 also introduces:
Browser Support
The numbers in the table specify the first browser version that fully supports CSS3 color values/property.
| Property | |||||
|---|---|---|---|---|---|
| RGBA, HSL, and HSLA | 4.0 | 9.0 | 3.0 | 3.1 | 10.1 |
| opacity | 4.0 | 9.0 | 2.0 | 3.1 | 10.1 |
RGBA Colors
RGBA color values are an extension of RGB color values with an alpha channel - which specifies the opacity for a color.
An RGBA color value is specified with: rgba(red, green, blue, alpha). The alpha parameter is a number between 0.0 (fully transparent) and 1.0 (fully opaque).
The following example defines different RGBA colors:
Example
#p1 {background-color: rgba(255, 0, 0, 0.3);} /* red
with opacity */
#p2 {background-color: rgba(0, 255, 0, 0.3);} /* green with opacity */
#p3 {background-color: rgba(0, 0, 255, 0.3);} /* blue
with opacity */
Try it Yourself
HSL Colors
HSL stands for Hue, Saturation and Lightness.
An HSL color value is specified with: hsl(hue, saturation, lightness).
The following example defines different HSL colors:
Example
#p1 {background-color: hsl(120, 100%, 50%);} /* green */
#p2 {background-color: hsl(120, 100%, 75%);} /* light green */
#p3 {background-color: hsl(120, 100%, 25%);} /* dark
green */
#p4 {background-color: hsl(120, 60%, 70%);} /* pastel green */
Try it Yourself
HSLA Colors
HSLA color values are an extension of HSL color values with an alpha channel - which specifies the opacity for a color.
An HSLA color value is specified with: hsla(hue, saturation, lightness, alpha), where the alpha parameter defines the opacity. The alpha parameter is a number between 0.0 (fully transparent) and 1.0 (fully opaque).
The following example defines different HSLA colors:
Example
#p1 {background-color: hsla(120, 100%, 50%, 0.3);} /* green with opacity */
#p2 {background-color: hsla(120, 100%, 75%, 0.3);} /* light green with opacity */
#p3 {background-color: hsla(120, 100%, 25%, 0.3);} /* dark
green with opacity */
#p4 {background-color: hsla(120, 60%, 70%, 0.3);} /* pastel green
with opacity */
Try it Yourself
Opacity
The CSS3 opacity property sets the opacity for a specified RGB value.
The opacity property value must be a number between 0.0 (fully transparent) and 1.0 (fully opaque).
Notice that the text above will also be opaque.
The following example shows different RGB values with opacity:
Example
#p1 {background-color:rgb(255,0,0);opacity:0.6;} /* red with opacity
*/
#p2 {background-color:rgb(0,255,0);opacity:0.6;} /* green with
opacity */
#p3 {background-color:rgb(0,0,255);opacity:0.6;} /* blue
with opacity */
Try it Yourself