Dark mode in chromium browsers
If you use a chromium browser and love dark mode, then keep reading.
Setting dark mode for everything
If you love dark mode for everything... you can enable Auto Dark Mode for Web Contents by setting chrome://flags/#enable-force-dark. If that does not work, then go to chrome://flags/ and search for Dark Mode.
Referenced from How do I set Google Calendar to Dark Mode?
turn on the flag Force Dark Mode for Web Contents you can do this by going to
chrome://flags/and searching for it