w-* / h-* (sizing)
class
Width and height utilities as percentages: 25, 50, 75, 100, auto. Viewport: vw-100, vh-100.
Syntax
class="w-100 h-50 mw-100 vh-100"
Example
html
<div class="w-100">Full width</div>
<div class="w-50">Half width</div>
<div class="w-25">Quarter width</div>
<div class="h-100 vh-100">Full viewport height</div>
<img class="img-fluid mw-100" src="photo.jpg" alt="Responsive">