Responsive CSS bars

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This was one of my favorite animations to create thus far, I got to use several techniques I have used on other projects including

Negative animation delay

A CSS only square container

Perfectly (to three decimal places) spaced animations

Based on http://31.media.tumblr.com/a0d1fbce4ef58e077d0274ad9bc746d1/tumblrmx37tz7pzO1r2geqjo1500.gif

This Pen uses: HTML, CSS, JavaScript, and -prefix-free