Stop Video on Modal Close

I have several modals, each with a different iframe with a different embedded youtube video.
When someone closes out of the modal (either by clicking away, hitting ESC or closing it), I would like the youtube video in the modal to stop.

I am not using bootstrap.

Below is an example of just one of the modals in action.

Any suggestions will help!

Fiddle


HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<a href="#" class="button"...

HTML:

Stop Video on Modal Close

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