finished-major-functionality-starting-UX-polish

Please use CSS classes and show/hide here. For example: 
* Create two divs, one with an up arrow, and one with a down arrow. 
* Toggle which one is shown on click.

The best way to do this is to just toggle a class on the overall div (e.g. "expanded"), and use css selectors. 

If a parent has class "expanded" show
If a parent does not have class "expanded" hide

An examplar of this is in https://github.com/pmitros/DoneXBlock/blob/master/done/static/css/done.css