Cant get smooth scroll code to work on project?

I’ve tried pasting the following code into my project, but it isn’t affecting the scroll. Does anyone know why this is?

Project link:
https://preview.webflow.com/preview/charlie-osbornes-cool-project?utm_medium=preview_link&utm_source=designer&utm_content=charlie-osbornes-cool-project&preview=104a21c35da3ce51788e16f9b35aa0af&mode=preview


Here is my site Read-Only: LINK
(how to share your site Read-Only link)