--- layout: docs title: Sizing description: Easily make an element as wide or as tall (relative to its parent) with our width and height utilities. group: utilities toc: true --- Width and height utilities are generated from the `$sizes` Sass map in `_variables.scss`. Includes support for `25%`, `50%`, `75%`, and `100%` by default. Modify those values as you need to generate different utilities here. {% example html %} <div class="w-25 p-3" style="background-color: #eee;">Width 25%</div> <div class="w-50 p-3" style="background-color: #eee;">Width 50%</div> <div class="w-75 p-3" style="background-color: #eee;">Width 75%</div> <div class="w-100 p-3" style="background-color: #eee;">Width 100%</div> {% endexample %} {% example html %} <div style="height: 100px; background-color: rgba(255,0,0,0.1);"> <div class="h-25 d-inline-block" style="width: 120px; background-color: rgba(0,0,255,.1)">Height 25%</div> <div class="h-50 d-inline-block" style="width: 120px; background-color: rgba(0,0,255,.1)">Height 50%</div> <div class="h-75 d-inline-block" style="width: 120px; background-color: rgba(0,0,255,.1)">Height 75%</div> <div class="h-100 d-inline-block" style="width: 120px; background-color: rgba(0,0,255,.1)">Height 100%</div> </div> {% endexample %} You can also use `max-width: 100%;` and `max-height: 100%;` utilities as needed. {% example html %} <img class="mw-100" data-src="holder.js/1000px100?text=Max-width%20%3D%20100%25" alt="Max-width 100%"> {% endexample %} {% example html %} <div style="height: 100px; background-color: rgba(255,0,0,0.1);"> <div class="mh-100" style="width: 100px; height: 200px; background-color: rgba(0,0,255,0.1);">Max-height 100%</div> </div> {% endexample %}