Here is the person's Twitter/X thread about it: https://x.com/_jzhao/status/1856103807903773015

First tweet announces it.

Second tweet has the deets: ------ shoutout to @daylightco and @_chloeyan for inspiring a lot of the effects used here! you can find a stripped down implementation here:

demo site: https://sunlit.pages.dev source: https://github.com/jackyzha0/sunlit

effects breakdown below... ------