Board Thread:Support Requests - Getting Technical/@comment-44703907-20200621062112/@comment-23989026-20200621071315

'theme=' and 'theme-source=' are controlled via w:c:cncfanon:MediaWiki:Wikia.css - which currently does not exist. To avoid unwanted vandalism, only Admin of a wiki have access to MediaWiki:Wikia.css which status you do not have.

An option available to Editor level is accent colors which can change the brown header color. Either add:
 * 1) 'accent-color-default=' → set a single background
 * 2) 'accent-color-source=' → changeable background

It uses HTML color names

I have added 'accent-color-source=' to the infobox and included an example on that page to show how to use.