Fix alignment of squareroot bar

Before this change:
![screen shot 2014-09-18 at 21 10 26](https://cloud.githubusercontent.com/assets/4062448/4330644/105828dc-3fb3-11e4-8c77-aa0ad91465e5.png)

After this change:
![screen shot 2014-09-18 at 21 10 19](https://cloud.githubusercontent.com/assets/4062448/4330646/16c46ce4-3fb3-11e4-909f-8c2f76c7d302.png)

Tested in Chrome and Safari