There are multiple ways to change the appearance, or theme, of an infobox, but the complexity of the task depends mainly on the type of infobox being used.
Portable infoboxes Bearbeiten
Portable infoboxes can be both the easiest to theme and, conceivably, the hardest to theme. This is because they have a default theme based on the colors chosen in the theme designer. While these can be changed or improved using MediaWiki:Wikia.css, the only users allowed to change it are admins/bureaucrats.
Theme gallery Bearbeiten
Classic infoboxes Bearbeiten
The appearance of classic infoboxes can be changed by any user by relying on inline styling, although some more complex changes can only be achieved by admins.
Lua infoboxes Bearbeiten
The InfoboxBuilder provides many ways of changing the look and feel of every row, column, and structure of the infobox. However, complex changes might require some knowledge of Lua.