Thank Apple for Reader View in Safari. If you are as incompetent in visual design as the author of that page, you should really stay away from dark mode. Your readers will thank you.
I tend to use green on black for daytime hacking and amber on black in the evenings to reduce blue light issues.
But I also habitually run with jacked up contrast and nerfed brightness, so I make no claims that what works for me would be a good idea for anybody else.