Thread:OH&S/@comment-28375530-20200708161331/@comment-25364614-20200710132111

Too complicated to explain. Template:Slider_generator has documentation on the template with links to relevant js and css pages. But you really need to spend time learning about how this site uses js and css and where the key pages are kept.

Also worth noting that if you created your wiki after March 2020, then it runs on a new MediaWiki platform and that might affect things further:

See also:
 * Help:CSS
 * Help:Unified_Community_Platform