If you have Chrome based browser you can force it to show all pages in dark mode:
"To find it, type “chrome://flags” into Chrome’s Omnibox and press Enter."
View attachment 8587
Search for “dark mode” in the search box at the top of the Experiments page that appears.
"Click the box to the right of “Auto Dark Mode for Web Contents” and select “Enabled” for the default setting"
Clicking Enable is the standard mode but I've chosen the 4th option "Enabled with simple Cielab-based inversion" this options looked better in my opinion.