Don't let known big cells expand forever.

Wrap them in a fixed-width div.

![](https://dl.dropboxusercontent.com/s/bjs09q3c1wsi6rg/2014-10-27%20at%204.22%20PM.png?dl=0)

`.last_error` probably shouldn't be hard-coded into the css. Is there some way to flag certain `extra_columns` as "large", and should be wrapped in the div?