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# Sizing

Easily make an element as wide or as tall with our width and height utilities.

## 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.

Width 25%
Width 50%
Width 75%
Width 100%
Width auto
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>
    <div class="w-auto p-3" style="background-color: #eee;">Width auto</div>

Height 25%
Height 50%
Height 75%
Height 100%
Height auto
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 class="h-auto d-inline-block" style="width: 120px; background-color: rgba(0,0,255,.1)">Height auto</div>
    </div>

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

html

    <img src="..." class="mw-100" alt="...">

Max-height 100%
html

    <div style="height: 100px; background-color: rgba(255,0,0,.1);">
      <div class="mh-100" style="width: 100px; height: 200px; background-color: rgba(0,0,255,.1);">Max-height 100%</div>
    </div>

## Relative to the viewport

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

    <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>

## Sass

### Utilities API

Sizing utilities are declared in our utilities API in `scss/_utilities.scss`. Learn how to use the utilities API.

        "width": (
          property: width,
          class: w,
          values: (
            25: 25%,
            50: 50%,
            75: 75%,
            100: 100%,
            auto: auto
          )
        ),
        "max-width": (
          property: max-width,
          class: mw,
          values: (100: 100%)
        ),
        "viewport-width": (
          property: width,
          class: vw,
          values: (100: 100vw)
        ),
        "min-viewport-width": (
          property: min-width,
          class: min-vw,
          values: (100: 100vw)
        ),
        "height": (
          property: height,
          class: h,
          values: (
            25: 25%,
            50: 50%,
            75: 75%,
            100: 100%,
            auto: auto
          )
        ),
        "max-height": (
          property: max-height,
          class: mh,
          values: (100: 100%)
        ),
        "viewport-height": (
          property: height,
          class: vh,
          values: (100: 100vh)
        ),
        "min-viewport-height": (
          property: min-height,
          class: min-vh,
          values: (100: 100vh)
        ),