If a person’s browser doesn’t have a “dark mode” feature option built in, they should search the browser’s home page for a “dark mode” extension or add-on they can add to the browser.
Try this for trippy dark mode.
IF you are in windows 10 or 11, cordana search for “inverted”.
It will take you to color filters.
Turn on color filters.
Then below select “Grayscale inverted”
FR will be in dark mode. lol