Added some styling.

Added just a little CSS to make the plugin to look like better.

![capture decran 2014-04-04 a 12 07 13](https://cloud.githubusercontent.com/assets/116530/2614073/f3c206da-bbe0-11e3-80f3-aa6cfb83496b.png)
![capture decran 2014-04-04 a 12 07 24](https://cloud.githubusercontent.com/assets/116530/2614074/f3c32be6-bbe0-11e3-8ee4-2b797644eddc.png)