Want to embed video in accordion with codepen

No experience with coding here. Trying to use code from this: https://codepen.io/payam13/pen/BaPQKxz but it isn't working on my site, ultimately I want to add a video in each of the accordion drop down tabs. Any suggestions?

If this specific accordion won't work with video, are there others I can use?

Oh, the other way to do it is to create a code block and copy first the html then in  <style>...code here...</style> to put the css and in <script> ...code here</script> to put the javascript.

I don't think the current accordion block  let's you do that. 

I wrote an article about this in the past, take a look, if you need further assistance let me know. I am planning to make also a video for this article. 

https://www.ui-workarounds.com/boosting-your-squarespace-accordion-with-videos-images-tables-lists-and-titles/