CSS changes.

RMM.

Things to do next:

* [ ] Make a develop or a feature branch
* [ ] Read http://csswizardry.com/2013/01/mindbemding-getting-your-head-round-bem-syntax/
* [ ] Read http://bem.info/method/definitions/
* [ ] Change all selectors to classes (unless otherwise makes sense)
* [ ] A few style changes (menu, text hierarchy - I'll talk to you about those)
* [ ] Make it responsive for mobile :)