Heartbeat {CSS}

I recreated this "heartbeat" animation in CSS for a website I built. I thought someone might be interested in it, so I decided to share it.

If you are interested in the CSS, come over to winfisdesign.com/heartbeat

Merry Christmas and Happy New Year, everyone! :)

PS: The animation in the GIF is not 100% accurate. Is there some sort of magic trick to get faster speed. Can't get it to work with PS.