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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!