How to remove stops in js code when scrolling?

Question

JavaScript

I have a button that moves down when clicked,
but when adapting, I noticed that if I change the distance by which
the button will move when clicked, stops appear. How to fix it?
Here is the link to Codepen: https://codepen.io/anon/pen/gEYwaK

Answer 1

the first cycle runs in any case - 100 pixels per second, the second - if the width is less than 2500 - 1000 pixels per second.
Didn't have any ideas?