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Opacity

The opacity property sets the opacity level for an element. The opacity level describes the transparency level, where 1 is not transparent at all, .5 is 50% visible, and 0 is completely transparent.

Set the opacity of an element using .opacity-{value} utilities.

<div class="opacity-100">...</div>
<div class="opacity-75">...</div>
<div class="opacity-50">...</div>
<div class="opacity-25">...</div>

Utilities API

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

    "opacity": (
      property: opacity,
      values: (
        0: 0,
        25: .25,
        50: .5,
        75: .75,
        100: 1,
      )
    ),
    

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https://getbootstrap.com/docs/5.1/utilities/opacity/