How to toggle in JavaScript?

Question

I want to toggle colors with one button on javascript, but I'm not really sure how.
I need help...
https://code.sololearn.com/WjEayTmv4vqn/?ref=app

Answer 1

https://code.sololearn.com/WKhl0bADtMt1/?ref=app

Answer 2

Ethan McCoy, now can you make it shift back and forth between each color?
Onclick make it turn green, onclick make it turn red,
onclick green,
onick, red.......

Answer 3

https://code.sololearn.com/WNb9eWc0z5L9/?ref=app

Your code works well, I just made the div visible.