How to achieve a scroll fade effect?

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Hi there,
I was wondering if it’s possible to achieve a “scroll fade” effect using Corvid?

Here is an example (see the small arrow at the bottom of the page, and how it behaves when the page is scrolled down): https://vero.co/

Here is my site, where I would like to achieve the same effect: https://www.notenoughknife.com/

I appreciate anybody who can help - I’m not the best at coding, so the more specific the code, the better!

Thanks in advance,
Matt