Enhancement request: Simple dark mode

[monkpit]

Hi!

Thanks for the great work on this project. I use it every day!

I have the Dark Reader Extension installed on Chrome, so everywhere I go I am greeted by friendly, eye-strain-reducing dark sites.

Due to the way Chrome extensions work, the extension cannot activate on file: protocol URLs.

So, every time I open a jest-stare report on my local machine, the sudden white background blasts me right in the retinas.

Would it be possible to have some simple CSS behind a flag, to output dark-mode?

My eyeballs would thank you...