Codepan app(lightbox) doesnt work in chrome PLEASE HELP

Codepan app(lightbox) doesnt work in chrome PLEASE HELP
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#1

this is the link http://s.codepen.io/boomerang/iFrameKey-aa9cf52c-f10d-1b1f-3b60-01059b04ad6a/index.html

like i said it doesnt work in chrome but in İE it works.
in chrome it gets crazy like going up and down when you click lightbox