Fix fallback gif alignment issue

added class definition to fallback img element. This should fix fallback gifs not aligning properly in some browsers.
Fix fallback gif alignment issue

Added class to the fallbackImg. this should fix the alignment issues for fallback gifs in some browsers.
Fix fallback img alignment issue

Added class to the fallbackImg. this should fix the alignment issues for fallback images in some browsers.
Merge pull request #1688 from markekraus/patch-4

Bug Fix: fallback image alignment for video expandos