Testing changeBackground

Note where the changeBackground function is situated in the JavaScript file. Use yours to make the backgrounds of the three boxes change (in order) to red, green, and blue whhen clicked and to revert to white when exited.

Code Challenge Can you get rid of the IDs for the three boxes and refactor your code to eliminate duplication? How can you use document.querySelectorAll to grab all of the div elements at once? Or can you change them to having a class and accomplish the same thing?