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CSS

CSS Concentric Ring Animation

I made a pen. I saw a concentric ring animation on another site and set out to build it myself. I am stuck on two issues:

1) How can I reverse the transition so that when you hover off the rings scale and fade out backwards?

2) Any ideas on how to make the animation appear more smoothly? It feels like it happens too rigidly, if that makes sense.

http://codepen.io/mtorosian/pen/jEYwRy

Updated pen with updated code, working nicely now.