Adding back margin for less button

In all that excitement I removed margin from `less` button. This PR is adding it back.

Before:
![screen shot 2014-12-16 at 11 47 25](https://cloud.githubusercontent.com/assets/2579465/5453037/0ddbeb8c-851a-11e4-92fc-b733d0bef5fc.png)

After:
![screen shot 2014-12-16 at 11 51 05](https://cloud.githubusercontent.com/assets/2579465/5453039/1326cf44-851a-11e4-818f-421b31529834.png)