In today’s tutorial we’re going to show you how to style your vertical navigation links so that as a visitor scrolls down the page, the menu link corresponding to the section they’re in will highlight.
It’s a nice little effect that adds a bit of interactivity between your web design and the user’s behaviour.

This method works particularly well if you’re creating a one-page website.

Read more: https://www.elegantthemes.com/blog/divi-resources/how-to-create-active-links-on-scroll-for-one-page-divi-websites