Thread:Nico-Wonderdust/@comment-171752-20160906222108/@comment-171752-20160915212857

As for the "Light" and "Dark" themes, I think it was done on CreepyPasta.wikia.com (top left corner) if I'm not mistaken Thanks for the heads up. I see that the JavaScript code that's making it possible is located here. If you want to use that script on your wiki, first be sure that you requested to have the JavaScript review process enabled. If you haven't, make the request using the form at Special:Contact/general.

Once JS review is enabled, copy all of the code from the Creepypasta Wiki over to MediaWiki:Common.js on your wiki. Then go to Special:JSPages and click the "Submit for review" button.