Create moving gradient background

How does this linear gradient overlay sweep through the gradient colors like that? I am trying to recreate this on a different page on my website. When I copy and paste this section into the other page, it doesn’t replicate the animation.

Here is my read-only link: (Webflow - Heeral's Wondrous Site)

hi @joulehome the sweep animation is triggered by Banner 3 Animation on page load.