bootstrap/site/content/docs/4.6/utilities/overflow.md

layout	title	description	group
docs	Overflow	Use these shorthand utilities for quickly configuring how content overflows an element.	utilities

Barebones overflow functionality is provided for two values by default, and they are not responsive.

This is an example of using .overflow-auto on an element with set width and height dimensions. By design, this content will vertically scroll.

This is an example of using .overflow-hidden on an element with set width and height dimensions.

<div class="overflow-auto">...</div>
<div class="overflow-hidden">...</div>

Using Sass variables, you may customize the overflow utilities by changing the $overflows variable in _variables.scss.