Ah, I'm glad you mentioned that; I took a look at it earlier, but I think what would be most helpful is just the most minimal set of CSS we could put in curly braces after prefers-color-scheme: dark. In other words, a patch to https://news.ycombinator.com/news.css that would strictly only add lines—and preferably the most minimal that would do the trick.

For sure. I can try and whip something up later tonight if no other solution presents itself before then. I can email it or post here.