---
title: Sizing
description: Easily make an element as wide or as tall with our width and height utilities.
toc: true
---

## Relative to the parent

Width and height utilities are generated from the utility API in `_utilities.scss`. Includes support for `25%`, `50%`, `75%`, `100%`, and `auto` by default. Modify those values as you need to generate different utilities here.

<Example class="bd-example-flex" code={`
Width 25%

Width 50%

Width 75%

Width 100%

Width auto
`} />

<Example class="bd-example-flex" code={`
    
Height 25%
    
Height 50%
    
Height 75%
    
Height 100%
    
Height auto
  
`} />

You can also use `max-width: 100%;` and `max-height: 100%;` utilities as needed.

<Example class="bd-example-flex" code={`
    
Max-width 100%
  
`} />

<Example class="bd-example-flex" code={`
    
Max-height 100%
  
`} />

## Relative to the viewport

You can also use utilities to set the width and height relative to the viewport.

```html
<div class="min-vw-100">Min-width 100vw</div>
<div class="min-vh-100">Min-height 100vh</div>
<div class="vw-100">Width 100vw</div>
<div class="vh-100">Height 100vh</div>
```

## CSS

### Sass utilities API

Sizing utilities are declared in our utilities API in `scss/_utilities.scss`. [Learn how to use the utilities API.]([[docsref:/utilities/api#using-the-api]])

<ScssDocs name="utils-sizing" file="scss/_utilities.scss" />
