This is a slightly modified version of the Black StackExchange theme:

https://userstyles.org/styles/98005/black-stack-exchange

Only included as a point of reference until the Dark version actually
works.  The modification is using regex on the domains instead of
individual domain entries.
Updated to working SO and SU version.
Initial preparations for a totally Dark SE style - nowhere near ready.
Adjusted format.

Primary domain at the top, followed by site specific rules (currently
gaming.SE), followed by catchall.

gaming.stackexchange rules from here:

https://userstyles.org/styles/100930/arqade-se-dark-style

Catchall rules use the slightly modified Black StackExchange code:

https://userstyles.org/styles/98005/black-stack-exchange

Still not ready for release.
Added Soda Chat from here:

https://userstyles.org/styles/97667/soda-chat

Used as a point of reference as with the Black SE code.
Old/current code that does not work, included as a point of reference
to make it easier to see what has been changed.
Added Soda Chat code sans SO refs until our SE changes have been made.
For my own records, to be deleted later.
The same as current stackechange-dark.css except with the Midnight Surfer rules for the main site.
The same as current stackechange-dark.css except with the Black SE rules for the main site.
Updated the chat section a bit.
Switched to use myfavcolours global-ish rule in order to prevent it breaking the UI.