Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):
Literally
Benefits (why should this be implemented?):
Eye care, better integration with OOUI and Codex
Feature summary (what you would like to be able to do and where): Add dark mode according to the method on https://www.mediawiki.org/wiki/Manual:How_to_make_a_MediaWiki_skin/zh#Using_the_default_Wikimedia_dark_mode_palette
And also integration with Theme Designer
Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution): Literally
Benefits (why should this be implemented?): Eye care, better integration with OOUI and Codex