Overlapping input and output boxes on cell phone.

Viewing for example [this page](https://vatlab.github.io/sos-docs/doc/documentation/Targets_and_Actions.html) on cell phone yields:

![image](https://user-images.githubusercontent.com/9889312/32620356-27e0dd0a-c543-11e7-8211-375b434d4b86.png)

We will need to adjust css for this.