diff --git a/guide/english/css/colors/index.md b/guide/english/css/colors/index.md
index 8759795334..dc13cd4fb8 100644
--- a/guide/english/css/colors/index.md
+++ b/guide/english/css/colors/index.md
@@ -52,10 +52,11 @@ Hex codes are expressed in this format: #000000, which would be the color black
 These three pairs each express a value for the amount of red, green and blue in a particular color. Taking the hexcode color #AA11BB, AA is the amount of red, 11 the amount of green, and BB the amount of blue. 0 is the lowest value of a color while f is the highest value.
 
 Hex codes are case insensitive, meaning that #FFFFFF and #ffffff would be the same color: white.
+It is also possible to use a three-digit notation as a short version, for example #ABC is equal to #AABBCC.
 
-Additionally, there are 16,777,216 possible color combinations using hexcode.
+Additionally, there are 16,777,216 possible color combinations using hexcode. A shorthand form also exists. The shorthand #ABC is equivalent to #AABBCC. In this form, 4096 colours are available.
 
-A shorthand form also exists. The shorthand #ABC is equivalent to #AABBCC. In this form, 4096 colours are available.
+Furthermore, some browser versions (see [compatibility](https://caniuse.com/#feat=css-rrggbbaa)) support hexcodes with 8 digits, where the last two digits describe the opacity level (00 - fully transparent, FF - fully opaque), equivalent to the alpha channel of rgba(). 
 
 ### Opacity
 
@@ -106,8 +107,9 @@ Above shows paragraphs styled bright orange and 20% transparent, h2 elements sal
 To get custom colors to use in CSS, you might find a color picker helpful. Some text editors have built-in color pickers, like Visual Studio Code. If you search "color picker" on Google or DuckDuckGo, you will get a color picker that you can use. Google Chrome and Firefox also have color picker add-ons that you can install. Adobe Color CC not only helps you pick a color, but will also help you pick out a color scheme for your web page! It's a good idea to check that you have enough contrast between your text and background colors by using a tool like WebAIM's Color Contrast Checker.
 
 #### More Information:
-<a href="https://color.adobe.com/" target="_blank">Adobe Color CC</a><br>
-<a href="https://chrome.google.com/webstore/detail/colorpick-eyedropper/ohcpnigalekghcmgcdcenkpelffpdolg?hl=en" target="_blank">ColorPick Eyedropper on Chrome Web Store</a><br>
-<a href="https://addons.mozilla.org/en-US/firefox/addon/colorzilla/" target="_blank">ColorZilla add-on for Firefox</a><br>
-<a href="http://www.colorhexa.com/" target="_blank">Explore different Hex colors</a><br>
-<a href="https://webaim.org/resources/contrastchecker/" target="_blank">WebAIM Color Contrast Checker</a>
+- [MDN Documentation](https://developer.mozilla.org/en-US/docs/Web/CSS/color_value)
+- [Adobe Color CC](https://color.adobe.com/)
+- [ColorPick Eyedropper on Chrome Web Store](https://chrome.google.com/webstore/detail/colorpick-eyedropper/ohcpnigalekghcmgcdcenkpelffpdolg?hl=en)
+- [ColorZilla add-on for Firefox](https://addons.mozilla.org/en-US/firefox/addon/colorzilla/)
+- [Explore different Hex colors](https://www.colorhexa.com/)
+- [WebAIM Color Contrast Checker](https://webaim.org/resources/contrastchecker/)