Improved sqrt layout in some browsers

Here's some screenshots of before and after:
![sqrt without adjustment](https://cloud.githubusercontent.com/assets/1044413/4298385/318e3d0e-3e21-11e4-8953-5b6921215a11.png)
![sqrt with adjustment](https://cloud.githubusercontent.com/assets/1044413/4298384/3187bf56-3e21-11e4-8ffc-fccf3b8aba46.png)