How to fix z-index animation on neighbour cards

Here I'm showing how to animate z-index to make hovered card appearing over its neighbours including that moments when sibling card looses its hovered state and is animating back to normal one.

This actually is a reply to Kevin's video https://youtu.be/tJa5Ay5bQuc?t=3361. Watch it too to find a lot of interesting things.

Links to jsfiddle:
Initial: https://jsfiddle.net/6tju308h/
Final: https://jsfiddle.net/6tju308h/1/

Видео How to fix z-index animation on neighbour cards канала QwDragon