Refraction effect

Hi I have client wanting to implement this refraction effect as seen here on this site:

From what I understand it uses JS and some custom code in the header to be achieved.

But I sadly only really know basic HTML and CSS so some help in how this effect or close to could be replicated on Webflow.

I honestly don’t even know if Webflow can host JS scripts.

So am at a complete loss on where to start regarding this.

Thanks in advance.