overflow:hidden works in Firefox but not in Chrome. Why?

I have been trying to play a bit with the CSS3 and build a Netscape logo purely out of CSS3 for training.

Here is the link:

http://alonbt.com/css3/netscape/

The thing is: In Firefox all looks well, but in Chrome something goes wrong. I assume this is the overflow:hidden I have - in Firefox it works but Chrome doesn't seem to render it well.

Any suggestions bout what might be the problem?