Animated line on scroll

Hi there,

I’m currently working on a site on which there is a dotted line taking the user down a page going to each individual item on the page, I need this line to animate as the user scrolls down but I have no clue on how do to that.

I’ve attached a screenshot of the line that needs to be animated and included my read only link.


Here is my public share link:
(how to access public share link)