Make next/tryagain arrows 80% size. Make text smaller.

Eventually we want to slice this arrow to be responsive ([one experiment here](http://jsfiddle.net/sQGsk/), didn't work in IE9). Until then, making it smaller and aligning to the non-tip side.

![image](https://cloud.githubusercontent.com/assets/206973/2923171/d50e89b8-d70e-11e3-945f-bf83d2abf1a3.png)