CSS arrow down bouncing

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Forked from [dodozhang21](http://codepen.io/dodozhang21/)'s Pen [CSS arrow down bouncing](http://codepen.io/dodozhang21/pen/siKtp/). Forked from [dodozhang21](http://codepen.io/dodozhang21/)'s Pen [CSS arrow down bouncing](http://codepen.io/dodozhang21/pen/siKtp/).