Thread:Sebastian pereira90/@comment-33240622-20180626014510/@comment-24530269-20180719092125

Oh lol, I feel honoured. =)

Yup, CSS and JS it is.

CSS is for design in general. Fonts, colours, shadows, fancy stuff, backgrounds, placement and position of stuff; everything pertaining to design. It's enabled by default, so if you have admin rights (not content moderator or below), you can go to MediaWiki:Common.css and MediaWiki:Chat.js.

JS, short for JavaScript, is for a wiki's functions and features. MediaWiki:ImportJS is always enabled - you just have to add  and then the rest detailed on the page on the Dev Wiki, where you can find most scripts. However, custom JS, where you can set options for scripts or write entirely new ones, is disabled by default and must be requested to be enabled through Special:Contact/general. After that you can go to MediaWiki:Common.js and MediaWiki:Chat.js.

If you have any questions or would like assistance, just go to my Message Wall and we'll continue there.