Chat and channel boxes' styles are "broken"

I have a fresh Kandan installation.
My setup is a 13" Macbook Pro running on OSX 10.8.4, Ruby 2.0.0-p195 and Rails 3.2.14.
These are the UI issues that I've found and I would like to know if anybody else is also having this:

![kandan](https://f.cloud.github.com/assets/196122/1244730/b101206e-2a8c-11e3-91f6-052569cb1608.png)
There is a gap on both sides of the screen between the shadow of the two elements, the header and the channel box (the feed/messages container). As soon as you start scrolling down you see the two shadows merging and the gap disappears but if you scroll all the way up again you'll be able to see it.

- - -
![kandan_and_kandan](https://f.cloud.github.com/assets/196122/1244742/1b558a9a-2a8d-11e3-918f-a567e62f8ab5.png)
There is an overflow on the chat box.

- - -

I have been able to reproduce these errors on:
* Chrome 29
* Safari 6.0.5
* Opera 15
* Firefox 24
* Firefox Nightly