Updates the layout dividers to add more space betwixt them on small screens. Also updates 2nd nav line height.

Ok, updated! Slightly increased the padding and added way more margins, which were definitely missing. It matches the design much better now thanks!

**Left:** HTML, **Right:** Static design

![image](https://cloud.githubusercontent.com/assets/1093373/4388846/5ced56f0-43ef-11e4-8e55-be39c118f8e5.png)