The rgba() functional notation expresses a color according to its red, green, and blue components. An optional alpha component represents the color's transparency.
The rgba() functional notation expresses a color according to its red, green, and blue components. An optional alpha component represents the color's transparency.
Note: CSS Colors Level 4 allows for space-separated in addition to comma-separated values.
rgba(255, 255, 255) /* white */ rgba(255, 255, 255, .5) /* white with 50% opacity */ rgba(255 255 255 / 0.5); /* CSS Colors 4 space-separated values */
rgba(R, G, B[, A])
R (red), G (green), and B (blue) can be either <number>s or <percentage>s, where the number 255 corresponds to 100%. A (alpha) can be a <number> between 0 and 1, or a <percentage>, where the number 1 corresponds to 100% (full opacity).
rgba(R G B[ / A])
CSS Colors Level 4 adds support for space-separated values in the functional notation.
| Specification |
|---|
| CSS Color Module Level 4 # rgb-functions |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
rgba |
1 |
12 |
3 |
9 |
10 |
3.1 |
≤37 |
18 |
4 |
10.1 |
2 |
1.0 |
float_values |
66 |
79 |
52 |
No |
53 |
12.1 |
66 |
66 |
52 |
47 |
12.2 |
9.0 |
space_separated_parameters |
65 |
79 |
52 |
No |
52 |
12.1 |
65 |
65 |
52 |
47 |
12.2 |
9.0 |
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https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/rgba