You can use this Joomla plugin to make any article's html, CSS, and javascript code seem beautiful.
It supports a variety of themes, including Sons of Obsidian, Desert, Sunburst, Doxy, and Prettify. Additionally, this plugin will allow you to enable/disable line numbers in the code snippet. It contains a straightforward shortcode called {codeprettify}...{/codeprettify}, any html, CSS, or javascript code entered within this brief code will be converted by this plugin and displayed in an attractive manner in any article.
