What is known as a 'skin' is how the page layout is displayed in your browser. In the MediaWiki website there are some default skins that are able to be reached through the Preference page of each user (IP users don't have that ability). MediaWiki also has given users the freedom to change how a specific skin looks in a general way (affecting users and IP users) and its done trough modifications on the MediaWiki:Monobook.css page. There is also 3rd stage where registered users can change how they see that modify skin through their personal User:USERNAME/monobook.css page (the letter M must be lower caps). There is a page on the mediawiki called MediaWiki:Common.css Changes done to that page will affect all the skins. Due to security reasons only Sysops and above can modify the MediaWiki pa