It is used to size the element. By using sizing utility, you can easily make an element as wide or as tall (relative to its parent) with our width and height utilities. Includes support for 25%, 50%, 75%, and 100% by default.
Width and height utilities are generated from the $sizes Sass map in _variables.scss. You can modify these values when you need to generate different utilities here.
The following example demonstrates setting width and height utilities for an element −
You can also set max width and height to an element by using mw-100 and mh-100 utilities as shown in the below example −