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Sizing

Bootstrap sizing is a utility which allows you to adjust elements width or height. There are 4 available values: 25%, 50%, 75% and 100%.

Width and height utilities are generated from the $sizes Sass map in _variables.scss. Modify those values as you need to generate different utilities here.

Width 25%
Width 50%
Width 75%
Width 100%
                
<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>
            
Height 25%
Height 50%
Height 75%
Height 100%
                
<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>
            

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

Max-width 100%
                
<img class="mw-100" src="..." alt="Max-width 100%">
                
            
Max-height 100%
                
<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>