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Re:Show HN: Darken – Darkmode Made Easy by iCarrot on Thursday January 16, 2020 @08:25PM (#22070981)
It has a demo page, "hidden" in the repo's description but not in README.md:

https://colinespinas.github.io/darken/

Re:Show HN: Darken – Darkmode Made Easy by Call_in on Thursday January 16, 2020 @08:37PM (#22071059)
You have a badge "Demo Available" too, I'll maybe do a more clear link.