Feature summary (what you would like to be able to do and where):
Wikidata Query Service (query.wikidata.org) should get dark mode support.

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):
dark mode for wikidata query service

Benefits (why should this be implemented?):
to get benefit people who prefer dark mode.