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Does it seem a bit off to anyone else in chrome?

http://www.imgur.com/7JA69Ty.png

Or is the browser chrome considered usable real estate.

You are correct, it is off by the height of the bar at the bottom of the window. It uses fixed positioning -- not absolute positioning as was prescribed in the hack. Also he sets the modal height to 50%. The CSS of the demo is not the CSS of the write-up.

This !!!!

You can also do this

position: relative; margin-top: 50%; transform: translateY(-50%);

You can, if you don't mind it breaking in IE < 9.

Looks good to me...

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