I am having some troubles with the document.querySelectorAll() because, I don't know why, it doesn't work when I add more than one class or ID.
So, this is what I want to achieve: http://codepen.io/sonder15478/pen/PpJqKN
But there's a lot of code that I wouldn't need if I use document.querySelectorAll().
This is where I get stuck: http://codepen.io/sonder15478/pen/xqXGXm
I also tried with getElementsByClassName(), but it didn't work either...
Any ideas?
Thank you!