Create a simple scroll indicator for your website by using css and jQuery. An animated arrow to show that content is below the fold.
It's open-source (MIT), free and easy to use.
AOS is a small library that allows you to animate elements as you scroll down, and up.
If you scroll back to top, element will animate to it's previous state and is ready to animate again if you scroll down.
jQuery.scrollable manages animated scrolling in windows, scrollable elements and iframes. It frees you from handling gotchas and edge cases and offers convenient, flexible options for animation.