Widget css fixes for full screen view

I know the widget is always in an iframe, so this fix doesn't address an actual bug, so just consider it me practicing and "defense in depth" - if someone ever changes the size of the iframe we don't look lame, at least things stay in their proper position. 

Before: http://cl.ly/image/473n3H1x0e1F
After: http://cl.ly/image/0r0u1s0B3j03