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Saw https://www.youtube.com/watch?v=An3QMWg3m1c linked last evening & gave the challenge a quick go myself.

My approach was a mostly #CSS one, with minimal HTML (no extra wrappers) and JS (used only to update top item index, ~200 bytes minified).

While it was working, it wasn't pretty, so today I polished the demo & heavily commented the CSS - check it out on @codepen: https://codepen.io/thebabydino/pen/jENaPjd