Embedded Calendar Pop up disabled - unable to click 'close'

Greetings -

I'm working on a site and have an embedded calendar...

https://kwocv3.squarespace.com/calendar-events

...using this JavaScript that was provided to me...

<div id="elvanto-calendar-1740"></div><script src="https://kwoc.elvanto.net/calendar_embed.js?c[]=add651f2-307c-11e5-af42-0673d9c9b5d6&fd=s&el_id=1740"></script>

If you notice the events (see Sundays) - when you click on one, you get a pop-up that shows more details. However, I am unable to click on the "close" button. I've checked w/ the provider of this JS, but they said it would be something on SquareSpaces end...

Any help would be greatly appreciated!

Isaac