DarkVector is a skin for MediaWiki like default Vector skin, but dark-colored.
Download the latest snapshot and extract it to your skins directory. Then include it in your LocalSettings.php file as in the following example:
wfLoadSkin( 'DarkVector' );
Custom CSS and JS
You can edit these pages:
to add style specific styles and scripts.
Please pay attention to a fact that skin name in these pages names is "Darkvector", not "DarkVector"