Set scrollbar thickness to 30

* Sets the scrollbar thicknesses to 30
* Waiting on further design discussion to integrate

![image](https://cloud.githubusercontent.com/assets/206973/3098038/b7fdb574-e5e6-11e3-9297-473cb20edd88.png)

![image](https://cloud.githubusercontent.com/assets/206973/3098043/c275c21c-e5e6-11e3-8baf-be4b7a9fe0a1.png)