PHP 8.3 / ZCA 3.7.5 / ZC 2.1.0

This is kind of a weird question, but is there a way to replicate the smooth transition that that "Back to Top" button does on some pages? For example, I have a (somewhat) long terms and conditions complete with a Table of Contents. I wanted to know is there a way to replicate the smooth scrolling back to top for like chapters?

I managed to replicate this with the following:

Code:
html {
  scroll-behavior: smooth;
}
But combining that with the "Back to Top" that pops up creates a weird stutter before it jumps back to top.