Minor css fixes

![screenshot from 2014-04-09 06 03 16](https://cloud.githubusercontent.com/assets/3650670/2653633/cf1210f8-bfc5-11e3-8c8e-54916ac5ea51.png)
Fixes top bar and icons mainly.
Most importantly, now I would need to make those huge white arrows smaller, and fix the text/icons on the 'status' menu
I'm new to gnome3, If you can tell me the names of these things I'll make a new PR