[keehun]

On iOS, there's a browser called "Insight" which can do this automatically by injecting styles. I've began using an app for night-time use so I can take advantage of dark mode.

[brundolf]

Overall I like Safari and I don't really want to change browsers just for a single website

[nkurz]

It's possible that one of the solutions here might work for you: https://www.alphr.com/safari-dark-mode/