No, actually the biggest difference is removing the `filter` property from the `.wave2` class which is used for rendering the background. With that removed the page is responsive even with the backdrop-filter - and it makes no visual difference AFAICS.
It's also perfectly responsive if you disable JavaScript. Maybe something related to the --positionX and --positionY CSS variables that are updated on every mouse move?
what's worse is that scrolling doesn't actually work unless you have the text area focused/under the wheel... very weird. Which is even worse for PgUp/Down as who would think to focus the area first for scrolling???
Edit: This is with Firefox 144 on Ubuntu 22.04