If you understand the box model - See the box model here
. The box model says that whatever you put inside an element cannot be larger than that element. margin/padding/border all count when figuring width/height.
...you would see that setting the height on your #content may be a mistake. At least setting the wrong height certainly is. If you set no height at all, a div element will naturally expand in height to enclose it's contents.
No idea if that will cure your issue though, I don't have Chrome or a Mac to test in for you ... sorry.
You might try validating, that bit on line 15 where you double up on
is invalid. See the links about validation in my signature line.
There are also a couple errors in your CSS.