I am admittedly not a fan of dark themes in general, but I feel they are done right when the dark background is toned down a bit so you're not staring at a pitch black screen. And not just by a few shades.
As an aside, I didn't even know GitHub had a dark theme. I just tried it and it was horrible. Then I switched from dark default to dark dimmed and it was much more tolerable, although I still prefer light.
I'll take your suggestion on-board at any rate, and might make some adjustments to the font-size, or cpl. Thanks for your help!
1: https://medium.com/ben-shoemate/optimum-web-readability-max-...
2: https://www.viget.com/articles/the-line-length-misconception...
That's what the inverted text is here, a curveball. It's not the problem itself but it is asking more of the user every line. Just eyeballing it, .blog-entry looks correct, at least text measure wise, with a max-width of 500px.
Anything #666 or higher is way too light for an aesthetically-pleasing dark background imo.
At 13.5:1, the contrast ratio on your site (#D8DAD7/#0F100F) is a bit much. With a background of #444444 the ratio would be 6.92:1, just shy of a AAA result.
You can check your colors at https://webaim.org/resources/contrastchecker/
edit:
Interesting discussion about the effect of fonts, dyslexia, and dark-mode wrt "too much contrast" in this UX StackExchange thread. https://ux.stackexchange.com/questions/123504/maximum-contra...
Edit- also I'm not the OP.