night.js is not showing any Dark / Light Button on WebSite [closed]

I had been trying hard to add night.js https://jb1905.github.io/night.js/ on my site but no button of Dark / Light Shows up on my site.

Here is my Test Page : https://freeairdrop.io/test/2.html

I have added all the scripts at the end of the page and have used "script tag in HTML" as an installation process.