Relative to the parent
Modify those values as you need to generate different utilities here.
Width 25%
Width 50%
Width 75%
Width 100%
Width auto
Code Example
<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
Code Example
<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.
max-width: 100%;
max-height: 100%;
Max-height 100%
Code Example
<img src="..." class="mw-100" alt="..."> <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.
Code Example
<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>