Remove tonal treatment of container titles on mobile

Such elegance

      Very lines        pls :+1: 
   wow

          much white

![image](https://cloud.githubusercontent.com/assets/85783/3843538/4cf5690a-1e41-11e4-9960-7245877c72da.png)

![ ](http://gifs.joelglovier.com/awkward/white-guys.gif)
I sometimes wonder why we don't use numbers.