I found it! It's not on their resources page, but is linked on their about page on the bottom (pastebin link to the code: https://pastebin.com/PiDgrv3J)
@pip-pepping oh man you're right, thank you so much "^^ i never would've found that
I always thought that chatboxes were kinda weird, and even creepy in some instances.
i found your site from a friend before i knew neocities!
i didnt find your site this way, but miku fans on social media mention it and spread the word abt it too!
If it weren't for Neocities, I probly woulda found you through a webring (becuz we're neighbors on one of em)
via the voca webring!!