Rgbcolors with alpha channel (#27219)
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@ -28,11 +28,14 @@ h1 {
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![twobackground](https://user-images.githubusercontent.com/26467304/31036152-0607936a-a539-11e7-9e9f-a5e60ade042d.png)
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In CSS color can be defined in four ways: (using white as an example)
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* A valid color name such as `white`.
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* A HEX value such as `#FFFFFF`.
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* An abreviated HEX value such as '#FFF'.
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* An RGB value such as `rgb(255,255,255)`.
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In CSS color can be defined in a few different ways:
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* A valid color name such as `blue`
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* A HEX value such as `#FFFFF` (This is the hex value for white.)
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* An abbreviated HEX value such as '#FFF'.
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* An RGB value such as `rgb(76,175,80)` (This is the RGB value for light green.)
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* RGBA color values are an extension of RGB color values with an alpha channel - which specifies the opacity of the object.
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* An RGBA color is specified with the rgba() function, which has the following syntax: `rgba(red, green, blue, alpha)`
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* The alpha parameter is a number between `0.0` (fully transparent) and `1.0` (fully opaque).
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### Background Images
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You can use the `background-image` property to set an image as a background for an element.
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