It is indeed using javascript to do those parts, eg https://github.com/internet-development/www-sacred/blob/4454ed1fae0b4b536bbd0636b8a78858268d748a/components/

It is indeed using javascript to do those parts, eg https://github.com/internet-development/www-sacred/blob/4454ed1fae0b4b536bbd0636b8a78858268d748a/components/BlockLoader.tsx#L38 https://github.com/internet-development/www-sacred/blob/4454... . My limited JS and React knowledge says that CSS is the right way to do most of that, or if that's not possible I think JS's requestAnimationFrame. React doesn't seem to be necessarily the issue here, though it may not be helping.