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Random loop CSS animations for each element

Hi,
I’m trying to achieve a similar effect to this site. I can see a lot of CSS animations in the HTML but I don’t think it’s a manual work behind. The idea is to get a “random/chaotic” feeling for each element.

I thought I can make X animations and assign a class to every Xth child but maybe there is a library to work with that I don’t know about.

Any suggestions?
Thanks