OTRS https://ticket.wikimedia.org/otrs/index.pl?Action=AgentTicketZoom;TicketID=11208223
When using any background color other than the default white, color code legends are not
visible.
Example:
Article - Blue Line (CTA) in the first infobox
https://en.m.wikipedia.org/wiki/Blue_Line_(CTA)
Default | Sepia | Gray | Black |