overscroll-behavior - CSS: Cascading Style Sheets | MDN
The overscroll-behavior CSS property sets what a browser does when reaching the boundary of a scrolling area. It's a shorthand for overscroll-behavior-x and overscroll-behavior-y . By default, mobile browsers tend to provide a "bounce" effect or even a page refresh when the top or bottom of a page (or other scroll area) is reached.
https://developer.mozilla.org/en-US/docs/Web/CSS/overscroll-behavior
