Adjusted fullscreen icon for windows users

The Windows versions of Chrome, IE10 and Firefox are displaying the scroll bars over part of the fullscreen button, which makes it difficult to click.

Before:
![fullscreen_icon_bug](https://f.cloud.github.com/assets/137686/1976427/49e741e0-838a-11e3-9ba2-dd4cfcf55ce5.png)

After:
![fullscreen_icon_bug_after](https://f.cloud.github.com/assets/137686/1976426/476a5c36-838a-11e3-99e0-484f7da5ae40.png)