CSS rgba() Function
The rgba() function define colors using the Red-green-blue-alpha (RGBA) model.
RGBA color values are an extension of RGB color values with an alpha channel — which specifies the opacity of the color.
Browser Support
The numbers in the table specify the first browser version that fully supports the function.
CSS Syntax
| Value | Description |
|---|---|
| red | Defines the intensity of red as an integer between 0 and 255, or as a percentage value between 0% and 100% |
| green | Defines the intensity of green as an integer between 0 and 255, or as a percentage value between 0% and 100% |
| blue | Defines the intensity of blue as an integer between 0 and 255, or as a percentage value between 0% and 100% |
| alpha | Defines the opacity as a number between 0.0 (fully transparent) and 1.0 (fully opaque) |
COLOR PICKER
Report Error
If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail:
Thank You For Helping Us!
Your message has been sent to W3Schools.
Top Tutorials
Top References
Top Examples
Get Certified
W3Schools is optimized for learning and training. Examples might be simplified to improve reading and learning. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. While using W3Schools, you agree to have read and accepted our terms of use, cookie and privacy policy.
CSS Colors
CSS supports 140+ color names, HEX values, RGB values, RGBA values, HSL values, HSLA values, and opacity.
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
HSL Colors
HSL stands for Hue, Saturation and Lightness.
An HSL color value is specified with: hsl(hue, saturation, 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.
The following example defines different HSL colors:
Example
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
Opacity
The CSS opacity property sets the opacity for the whole element (both background color and text will be opaque/transparent).
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 transparent/opaque!
The following example shows different elements with opacity: