On Gaki no Tsukai Wiki, I noticed that the portable infoboxes has this "pi-europa" class applied, which overbloats it up (example). I don't know when and how this thing became a thing as I've had a little sabbatical the last few months. A quick look into other wikis (Gravity Falls Wiki) reveals that it has the original look and a "wikia" theme applied without the theme being specifically set in the template.
How can this be turned off? Does it require admin access? I'm currently not an admin on GnT Wiki but I plan to - I'm just not active enough to nag the wiki admin about it.