Below you will find a working example, along with source code and links to download the card images.
The card are already shuffled. To start playing, click on the card pile on the left:
Complete source code
Changes and enhancements
From the original code we've made a couple of important changes. Firstly, we've removed the browser-prefixes from our CSS as most/all browsers now support CSS Transforms. We've also added some randomness to the card placement to make things more realistic.
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Marcus 21 May, 2020
I love this so as part of my COVID codecamp I have had a play with the new things I learnt and spun up this from your base.
I was using the unicode for another maths game for the kids so thought I would try to apply it.