It looks like the code might've been pasted wrong? I tried importing it into my deck and it didn't load correctly. I would love it if this was fixed since it does exactly what I need!
I can't seem to get the widget by itself to paste correctly. I tried uploading it to another site but it just comes back blank.
Meanwhile, I just uploaded an entire deck with nothing but the widget:
https://gist.github.com/tangentstorm/37a26ebf0dc438eae1e765675b73ecd0