[GordonS]

I've been using a Firefox plugin that let's you style sites with alternative CSS for years to achieve something similar on GitHub (I forget the name, but it is pretty popular) - every now and then something on the site looks a bit weird until the styles are updated to keep in sync with GitHub tho.

I personally think GitHub have got this just right, I love it! (I'm red/green colour blind tho, and do tend towards preferring a bit more contrast).

[rurp]

I use the Dark Reader plugin on Firefox and it is incredible. It works perfectly on almost all sites, which is quite an accomplishment given how many site-specific dark modes are either poorly done or non-existent.