[CSS] Background styles

- Background styles CSS.
- Simplify UI.
- No Logic touched.
- Peer Review welcome, to be Merged soon since its only CSS.


![brython_new_look](https://cloud.githubusercontent.com/assets/1189414/4845030/51acb8e4-6041-11e4-8b3f-c98690f2a88d.jpg)


:octocat: