jHighlight is a Joomla plugin and syntax highlighter to help Joomla webmaster highlight code syntax.
It uses https://highlightjs.org/
Demo (63 skins): https://highlightjs.org/static/demo/
+1 Skin (Visual Studio Dark)
Go into your Backend-> Extensions-> Extensions Manager-> Upload Package File and upload it.
Don't forget to enable it.
Go into your Backend-> Plugins-> System and enable "System - jHighlight"
How to use
<pre><code class="csharp"> YOUR CODE HERE </code></pre>
(Sometimes it's better to toogle the Editor off to insert a "raw" snippet)
There are currently 125 languages supported.
Css-class-names for those can be found here: http://highlightjs.readthedocs.org/en/latest/css-classes-reference.html
There are 64 skins to choose from. See here for reference: https://highlightjs.org/static/demo/
Go to Backend-> Plugins and open "System - jHighlight".
Choose a skin and press "Save & close"