Stopwatch: fixed alignment, better dark theme colors

This fixes both #705 and #848.
![screenshot from 2014-07-05 20 55 33](https://cloud.githubusercontent.com/assets/4411471/3487830/cd994f84-04a8-11e4-8691-4b312b948355.png)
![screenshot from 2014-07-05 20 55 49](https://cloud.githubusercontent.com/assets/4411471/3487831/d19d8622-04a8-11e4-87a3-6a736d3caaaa.png)
<img src="https://cloud.githubusercontent.com/assets/4411471/3487835/11e6090c-04a9-11e4-963a-bf3c348d5f33.PNG" width="250"/>

I'm interested in the status of #492, @moollaza it's still an issue, right?