I created this project whilst working through the odin project, a tutorial on web development years ago. When I created it, I found it really enjoyable and knew coding/programming was for me.
I learnt alot about Javascript and even handling through this project when I first started, I also really enjoyed it.
For some reason the rainbow toggle stopped working (maybe I forgot to push a commit) but I fixed it just now (problem was event handling was looking for rainbowOn not rainbow-on class).
You can view this project on GitHub