Opacity utilities set the transparency of a whole element, content included: opacity-100, -75, -50, -25 and -0. Use them for disabled looks, faded thumbnails or decoration; when only a background or border should fade, use bg-opacity-* or border-opacity-* instead.
1Opacity scale
opacity-100, -75, -50, -25 and -0 make the whole element, content included, more transparent - keep text out of strongly faded elements.
100
75
50
25
0
<div class="d-flex flex-wrap gap-3 small text-center">
<div>
<div class="bg-primary rounded-3 opacity-100 mb-1" style="width:4rem;height:3rem">
</div>
100
</div>
<div>
<div class="bg-primary rounded-3 opacity-75 mb-1" style="width:4rem;height:3rem">
</div>
75
</div>
<div>
<div class="bg-primary rounded-3 opacity-50 mb-1" style="width:4rem;height:3rem">
</div>
50
</div>
<div>
<div class="bg-primary rounded-3 opacity-25 mb-1" style="width:4rem;height:3rem">
</div>
25
</div>
<div>
<div class="bg-primary rounded-3 opacity-0 border mb-1" style="width:4rem;height:3rem">
</div>
0
</div>
</div>2Opacity versus bg-opacity
opacity-50 fades the text too, bg-opacity-50 fades only the background.
opacity-50
bg-opacity-50
<div class="row g-2">
<div class="col-sm-6">
<figure class="mb-0">
<div inert>
<div class="bg-success text-white rounded-3 p-3 opacity-50 fw-semibold">
opacity-50
</div>
</div>
<figcaption class="small text-body-secondary mt-2 mb-0">The text fades too - here below 4.5:1.</figcaption>
</figure>
</div>
<div class="col-sm-6">
<div class="bg-success bg-opacity-50 rounded-3 p-3 fw-semibold">
bg-opacity-50
</div>
</div>
</div>3Disabled looking card
opacity-50 with pe-none shows an option that is not available yet.
Personal training
Available
Online coaching
Coming soon
<div class="row g-2">
<div class="col-sm-6">
<div class="border rounded-3 p-3">
<div class="fw-semibold">
Personal training
</div>
<div class="small text-body-secondary">
Available
</div>
</div>
</div>
<div class="col-sm-6">
<div class="border rounded-3 p-3 opacity-50 pe-none" role="group" aria-disabled="true">
<div class="fw-semibold">
Online coaching
</div>
<div class="small text-body-secondary">
Coming soon
</div>
</div>
</div>
</div>4Faded image gallery
Non-selected thumbnails at opacity-50, the active one at full opacity.
<div class="d-flex gap-2">
<img src="https://images.unsplash.com/photo-1778828494354-9b717d36dc99?auto=format&fit=crop&w=800&h=800&q=70" alt="Thumbnail 1" width="80" height="80" class="rounded-3 object-fit-cover border border-2 border-primary"> <img src="https://images.unsplash.com/photo-1574680096145-d05b474e2155?auto=format&fit=crop&w=800&h=800&q=70" alt="Thumbnail 2" width="80" height="80" class="rounded-3 object-fit-cover opacity-50"> <img src="https://images.unsplash.com/photo-1641337221253-fdc7237f6b61?auto=format&fit=crop&w=800&h=800&q=70" alt="Thumbnail 3" width="80" height="80" class="rounded-3 object-fit-cover opacity-50">
</div>5Logo wall
Partner logos at opacity-50 look calm and uniform.
<div class="d-flex flex-wrap justify-content-center align-items-center gap-4">
<img src="../assets/img/logo-1.svg" alt="Partner logo" width="120" class="opacity-50"> <img src="../assets/img/logo-2.svg" alt="Partner logo" width="120" class="opacity-50"> <img src="../assets/img/logo-3.svg" alt="Partner logo" width="120" class="opacity-50"> <img src="../assets/img/logo-4.svg" alt="Partner logo" width="120" class="opacity-50">
</div>6Completed tasks
Done items drop to opacity-75 and get a line through - still readable (opacity-50 text is below 4.5:1).
- Online coaching
- Personal training
- Recovery spa
<ul class="list-unstyled mb-0 d-grid gap-2">
<li class="opacity-75 text-decoration-line-through"><i class="bi bi-check-square" aria-hidden="true"></i> Online coaching</li>
<li class="opacity-75 text-decoration-line-through"><i class="bi bi-check-square" aria-hidden="true"></i> Personal training</li>
<li><i class="bi bi-square" aria-hidden="true"></i> Recovery spa</li>
</ul>7Watermark text
Huge text at opacity-25 behind a heading as a decorative watermark (inert and aria-hidden: decoration has no contrast requirement).
Find the workout you will love
We measure success by how many members come back and tell their friends.
<div class="position-relative overflow-hidden rounded-4 bg-body-tertiary p-4">
<div class="position-absolute top-50 start-50 translate-middle display-1 fw-bold text-primary opacity-25 text-nowrap pe-none" aria-hidden="true" inert>
2020
</div>
<h3 class="position-relative h5 fw-semibold mb-1">Find the workout you will love</h3>
<p class="position-relative small mb-0">We measure success by how many members come back and tell their friends.</p>
</div>8Muted icons
Decorative icons at opacity-75 or -50 next to labels.
- 347 Harbour Road, Dublin
- +1 (555) 485-3268
- ethan.morgan@example.com
<ul class="list-unstyled mb-0 d-grid gap-2">
<li><span class="opacity-50 me-2"><i class="bi bi-geo-alt" aria-hidden="true"></i></span>347 Harbour Road, Dublin</li>
<li><span class="opacity-50 me-2"><i class="bi bi-telephone" aria-hidden="true"></i></span>+1 (555) 485-3268</li>
<li><span class="opacity-50 me-2"><i class="bi bi-envelope" aria-hidden="true"></i></span>ethan.morgan@example.com</li>
</ul>9Inactive steps
Future steps of a progress indicator at opacity-50, marked aria-disabled until they can be reached.
1 Cart
2 Shipping
3 Payment
4 Review
<div class="d-flex flex-wrap gap-3 small fw-medium">
<span class="d-flex align-items-center gap-1"><span class="badge rounded-pill text-bg-success">1</span> Cart</span> <span class="d-flex align-items-center gap-1"><span class="badge rounded-pill text-bg-primary">2</span> Shipping</span> <span class="d-flex align-items-center gap-1 opacity-50" role="group" aria-disabled="true"><span class="badge rounded-pill text-bg-secondary">3</span> Payment</span> <span class="d-flex align-items-center gap-1 opacity-50" role="group" aria-disabled="true"><span class="badge rounded-pill text-bg-secondary">4</span> Review</span>
</div>10Hidden but taking space
opacity-0 keeps the layout slot, so neighbours do not move.
ABC<div class="d-flex gap-2">
<div class="bg-info-subtle rounded-3 p-3">
<code class="small">A</code>
</div>
<div class="bg-info-subtle rounded-3 p-3 opacity-0">
<code class="small">B</code>
</div>
<div class="bg-info-subtle rounded-3 p-3">
<code class="small">C</code>
</div>
</div>11Image tint over colour
An image at opacity-75 on a bg-primary parent picks up a brand tint.
<div class="bg-primary rounded-4 overflow-hidden" style="max-width:24rem">
<img src="https://images.unsplash.com/photo-1641337221253-fdc7237f6b61?auto=format&fit=crop&w=1200&h=800&q=70" alt="Stronger every single day" class="w-100 d-block opacity-75">
</div>12Secondary actions
Quiet actions next to the main one: a link-style button, and opacity-50 on an action that is not available (a disabled button).
<div class="d-flex flex-wrap gap-2">
<button type="button" class="btn btn-primary">Save</button>
<button type="button" class="btn btn-link link-secondary">Duplicate</button>
<button type="button" class="btn btn-outline-secondary opacity-50" disabled>Archive</button>
</div>13Out of stock products
The sold out item has its picture at opacity-50, a label and its text at opacity-75 (still readable).
Monthly pass
$69.79
Sold out10-class pack
$27.01
<div class="row g-3">
<div class="col-6 col-md-4">
<div class="border rounded-3 p-2">
<img src="../assets/img/product-1.svg" alt="Monthly pass" class="w-100 rounded-2">
<div class="small fw-medium mt-2 text-truncate">
Monthly pass
</div>
<div class="small">
$69.79
</div>
</div>
</div>
<div class="col-6 col-md-4">
<div class="border rounded-3 p-2 position-relative">
<img src="../assets/img/product-2.svg" alt="10-class pack" class="w-100 rounded-2 opacity-50"><span class="badge text-bg-dark position-absolute top-0 start-0 m-3">Sold out</span>
<div class="small fw-medium mt-2 text-truncate opacity-75">
10-class pack
</div>
<div class="small opacity-75">
$27.01
</div>
</div>
</div>
</div>14Placeholder skeleton
Rows of bg-body-secondary at opacity-75 sketch content while it loads.
<div class="d-flex gap-3 align-items-center" aria-hidden="true">
<div class="bg-body-secondary rounded-circle opacity-75" style="width:48px;height:48px">
</div>
<div class="flex-grow-1">
<div class="bg-body-secondary rounded-pill mb-2 w-50 opacity-75" style="height:10px">
</div>
<div class="bg-body-secondary rounded-pill w-75 opacity-50" style="height:10px">
</div>
</div>
</div>15Fading list
Older entries step down in opacity to suggest age.
- Move more, stress less
- Feel at home in your gym
- Classes that keep you coming back
- Fitness for every body
<figure class="mb-0">
<div inert>
<ol class="list-unstyled mb-0 d-grid gap-1">
<li class="opacity-100">Move more, stress less</li>
<li class="opacity-75">Feel at home in your gym</li>
<li class="opacity-50">Classes that keep you coming back</li>
<li class="opacity-25">Fitness for every body</li>
</ol>
</div>
<figcaption class="small text-body-secondary mt-2 mb-0">From opacity-50 down the entries are decoration - below 4.5:1, so link to the full history instead of fading what people must read.</figcaption>
</figure>16Background pattern dots
Large icons at opacity-25 placed in a corner decorate a banner.
Better habits start this week
More than sixty classes a week, from sunrise yoga to late-night spin.
<div class="position-relative overflow-hidden text-bg-primary rounded-4 p-4">
<span class="position-absolute top-0 end-0 display-1 opacity-25 me-3" aria-hidden="true"><i class="bi bi-stars" aria-hidden="true"></i></span>
<h3 class="h5 fw-semibold position-relative">Better habits start this week</h3>
<p class="small mb-0 position-relative">More than sixty classes a week, from sunrise yoga to late-night spin.</p>
</div>17Unavailable time slots
Booked slots are disabled buttons at opacity-25 among the free slots.
<div class="d-flex flex-wrap gap-2" role="group" aria-label="Time slots">
<button type="button" class="btn btn-sm btn-outline-secondary">09:00</button>
<button type="button" class="btn btn-sm btn-outline-secondary opacity-25" disabled>09:30</button>
<button type="button" class="btn btn-sm btn-outline-secondary">10:00</button>
<button type="button" class="btn btn-sm btn-outline-secondary opacity-25" disabled>10:30</button>
<button type="button" class="btn btn-sm btn-primary" aria-pressed="true">11:00</button>
<button type="button" class="btn btn-sm btn-outline-secondary">11:30</button>
</div>18Subdued footnote
A small footnote at opacity-75 below the main content.
Online coaching keeps you on track when you travel. Certified coaches design every session around your level and your goals.
* Modern equipment is cleaned, serviced and ready every day.
<div>
<p class="mb-1">Online coaching keeps you on track when you travel. Certified coaches design every session around your level and your goals.</p>
<p class="small opacity-75 mb-0">* Modern equipment is cleaned, serviced and ready every day.</p>
</div>19Overlay controls
Controls on top of an image sit on a dark pill at reduced background opacity.
<div class="position-relative rounded-4 overflow-hidden" style="max-width:26rem">
<img src="https://images.unsplash.com/photo-1583454110551-21f2fa2afe61?auto=format&fit=crop&w=1600&h=700&q=70" alt="Building a workout habit that lasts" class="w-100 d-block">
<div class="position-absolute bottom-0 start-50 translate-middle-x mb-3 bg-dark bg-opacity-50 rounded-pill px-3 py-1 d-flex gap-3 text-white">
<span><i class="bi bi-skip-backward-fill" aria-hidden="true"></i></span><span><i class="bi bi-play-fill" aria-hidden="true"></i></span><span><i class="bi bi-skip-forward-fill" aria-hidden="true"></i></span>
</div>
</div>20Avatar of inactive member
Members who left the team are shown at opacity-75 - quieter, still readable.
Omar Patel
Ravi Rossi (inactive)
<ul class="list-unstyled mb-0 d-grid gap-2">
<li class="d-flex align-items-center gap-2"><img src="../assets/img/avatar-4.svg" alt="" width="32" height="32" class="rounded-circle"><span>Omar Patel</span></li>
<li class="d-flex align-items-center gap-2 opacity-75"><img src="../assets/img/avatar-5.svg" alt="" width="32" height="32" class="rounded-circle"><span>Ravi Rossi <small>(inactive)</small></span></li>
</ul>