From 6b581d6f817a66138f5181a5f1d39c9119ea6e5c Mon Sep 17 00:00:00 2001
From: Agnes Brettl <42897234+brettl1991@users.noreply.github.com>
Date: Sat, 2 Mar 2019 17:00:44 +0000
Subject: [PATCH] Rgbcolors with alpha channel (#27219)

---
 guide/english/css/background/index.md | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/guide/english/css/background/index.md b/guide/english/css/background/index.md
index b03bb7237c..d85efea16a 100644
--- a/guide/english/css/background/index.md
+++ b/guide/english/css/background/index.md
@@ -28,11 +28,14 @@ h1 {
 ```
 ![twobackground](https://user-images.githubusercontent.com/26467304/31036152-0607936a-a539-11e7-9e9f-a5e60ade042d.png)
 
-In CSS color can be defined in four ways: (using white as an example)
-* A valid color name such as `white`.
-* A HEX value such as `#FFFFFF`.
-* An abreviated HEX value such as '#FFF'.
-* An RGB value such as `rgb(255,255,255)`.
+In CSS color can be defined in a few different ways:
+* A valid color name such as `blue`
+* A HEX value such as `#FFFFF` (This is the hex value for white.)
+* An abbreviated HEX value such as '#FFF'.
+* An RGB value such as `rgb(76,175,80)` (This is the RGB value for light green.)
+* RGBA color values are an extension of RGB color values with an alpha channel - which specifies the opacity of the object.
+    * An RGBA color is specified with the rgba() function, which has the following syntax: `rgba(red, green, blue, alpha)`
+    * The alpha parameter is a number between `0.0` (fully transparent) and `1.0` (fully opaque).
 
 ### Background Images
 You can use the `background-image` property to set an image as a background for an element.