Helper Classes

For all common styling needs, it is recommended to use Bootstrap's utility classes. Refer to the official Bootstrap Documentation for a comprehensive list of available utilities.

With our extended low-level utility classes, you can build and customize components effortlessly—without writing a single line of custom CSS or SASS.

Background color

Similar to the contextual text color classes, set the background of an element to any contextual class. Background utilities do not set color, so in some cases you’ll want to use .text-* color utilities.

Background utilities like .bg-* that generated from our original $theme-colors Sass map don’t yet respond to color modes, however, any .bg-*-subtle utility will. This will be resolved in v6.
.bg-primary
.bg-primary-subtle
.bg-secondary
.bg-secondary-subtle
.bg-success
.bg-success-subtle
.bg-danger
.bg-danger-subtle
.bg-warning
.bg-warning-subtle
.bg-info
.bg-info-subtle
.bg-light
.bg-light-subtle
.bg-dark
.bg-dark-subtle
.bg-body-secondary
.bg-body-tertiary
.bg-body
.bg-black
.bg-white
.bg-transparent
                    
<div class="p-3 mb-2 bg-primary text-white">.bg-primary</div>
<div class="p-3 mb-2 bg-primary-subtle text-primary-emphasis">.bg-primary-subtle</div>
<div class="p-3 mb-2 bg-secondary text-white">.bg-secondary</div>
<div class="p-3 mb-2 bg-secondary-subtle text-secondary-emphasis">.bg-secondary-subtle</div>
<div class="p-3 mb-2 bg-success text-white">.bg-success</div>
<div class="p-3 mb-2 bg-success-subtle text-success-emphasis">.bg-success-subtle</div>
<div class="p-3 mb-2 bg-danger text-white">.bg-danger</div>
<div class="p-3 mb-2 bg-danger-subtle text-danger-emphasis">.bg-danger-subtle</div>
<div class="p-3 mb-2 bg-warning text-dark">.bg-warning</div>
<div class="p-3 mb-2 bg-warning-subtle text-warning-emphasis">.bg-warning-subtle</div>
<div class="p-3 mb-2 bg-info text-dark">.bg-info</div>
<div class="p-3 mb-2 bg-info-subtle text-info-emphasis">.bg-info-subtle</div>
<div class="p-3 mb-2 bg-light text-dark">.bg-light</div>
<div class="p-3 mb-2 bg-light-subtle text-light-emphasis">.bg-light-subtle</div>
<div class="p-3 mb-2 bg-dark text-white">.bg-dark</div>
<div class="p-3 mb-2 bg-dark-subtle text-dark-emphasis">.bg-dark-subtle</div>
<div class="p-3 mb-2 bg-body-secondary">.bg-body-secondary</div>
<div class="p-3 mb-2 bg-body-tertiary">.bg-body-tertiary</div>
<div class="p-3 mb-2 bg-body text-body">.bg-body</div>
<div class="p-3 mb-2 bg-black text-white">.bg-black</div>
<div class="p-3 mb-2 bg-white text-dark">.bg-white</div>
<div class="p-3 mb-2 bg-transparent text-body">.bg-transparent</div>

Border

Use border utilities to add or remove an element’s borders. Choose from all borders or one at a time. 

                    
<span class="border"></span>
<span class="border-top"></span>
<span class="border-end"></span>
<span class="border-bottom"></span>
<span class="border-start"></span>

Colors

Colorize text with color utilities. If you want to colorize links, you can use the .link-* helper classes which have :hover and :focus states.

Color utilities like .text-* that generated from our original $theme-colors Sass map don’t yet respond to color modes, however, any .text-*-emphasis utility will. This will be resolved in v6.

.text-primary

.text-primary-emphasis

.text-secondary

.text-secondary-emphasis

.text-success

.text-success-emphasis

.text-danger

.text-danger-emphasis

.text-warning

.text-warning-emphasis

.text-info

.text-info-emphasis

.text-light

.text-light-emphasis

.text-dark

.text-dark-emphasis

.text-body

.text-body-emphasis

.text-body-secondary

.text-body-tertiary

.text-black

.text-white

.text-black-50

.text-white-50

                    
<p class="text-primary">.text-primary</p>
<p class="text-primary-emphasis">.text-primary-emphasis</p>
<p class="text-secondary">.text-secondary</p>
<p class="text-secondary-emphasis">.text-secondary-emphasis</p>
<p class="text-success">.text-success</p>
<p class="text-success-emphasis">.text-success-emphasis</p>
<p class="text-danger">.text-danger</p>
<p class="text-danger-emphasis">.text-danger-emphasis</p>
<p class="text-warning bg-dark">.text-warning</p>
<p class="text-warning-emphasis">.text-warning-emphasis</p>
<p class="text-info bg-dark">.text-info</p>
<p class="text-info-emphasis">.text-info-emphasis</p>
<p class="text-light bg-dark">.text-light</p>
<p class="text-light-emphasis">.text-light-emphasis</p>
<p class="text-dark bg-white">.text-dark</p>
<p class="text-dark-emphasis">.text-dark-emphasis</p>

<p class="text-body">.text-body</p>
<p class="text-body-emphasis">.text-body-emphasis</p>
<p class="text-body-secondary">.text-body-secondary</p>
<p class="text-body-tertiary">.text-body-tertiary</p>

<p class="text-black bg-white">.text-black</p>
<p class="text-white bg-dark">.text-white</p>
<p class="text-black-50 bg-white">.text-black-50</p>
<p class="text-white-50 bg-dark">.text-white-50</p>

Link

Change the alpha opacity of the link rgba() color value with utilities. Please be aware that changes to a color’s opacity can lead to links with insufficient contrast. 

                    
<p><a class="link-opacity-10" href="#">Link opacity 10</a></p>
<p><a class="link-opacity-25" href="#">Link opacity 25</a></p>
<p><a class="link-opacity-50" href="#">Link opacity 50</a></p>
<p><a class="link-opacity-75" href="#">Link opacity 75</a></p>
<p><a class="link-opacity-100" href="#">Link opacity 100</a></p>

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.

100%
75%
50%
25%
0%
                    
<div class="d-flex align-items-center gap-3">
  <div class="opacity-100 p-3 bg-primary text-light fw-bold rounded">100%</div>
  <div class="opacity-75 p-3 bg-primary text-light fw-bold rounded">75%</div>
  <div class="opacity-50 p-3 bg-primary text-light fw-bold rounded">50%</div>
  <div class="opacity-25 p-3 bg-primary text-light fw-bold rounded">25%</div>
  <div class="opacity-0 p-3 bg-primary text-light fw-bold rounded">0%</div>
</div>

Shadows

While shadows on components are disabled by default in Bootstrap and can be enabled via $enable-shadows, you can also quickly add or remove a shadow with our box-shadow utility classes. Includes support for .shadow-none and three default sizes (which have associated variables to match).

No shadow
Small shadow
Regular shadow
Larger shadow
                    
<div class="shadow-none p-3 mb-5 bg-body-tertiary rounded">No shadow</div>
<div class="shadow-sm p-3 mb-5 bg-body-tertiary rounded">Small shadow</div>
<div class="shadow p-3 mb-5 bg-body-tertiary rounded">Regular shadow</div>
<div class="shadow-lg p-3 mb-5 bg-body-tertiary rounded">Larger shadow</div>

Sizing

Width and height utilities are generated from the utility API in _utilities.scss. Includes support for 25%, 50%, 75%, 100%, and auto by default. Modify those values as you need to generate different utilities here.

Width 25%
Width 50%
Width 75%
Width 100%
Width auto
                    
<div class="w-25 p-3 bg-primary-subtle text-primary border border-primary">Width 25%</div>
<div class="w-50 p-3 bg-primary-subtle text-primary border border-primary">Width 50%</div>
<div class="w-75 p-3 bg-primary-subtle text-primary border border-primary">Width 75%</div>
<div class="w-100 p-3 bg-primary-subtle text-primary border border-primary">Width 100%</div>
<div class="w-auto p-3 bg-primary-subtle text-primary border border-primary">Width auto</div>
Height 25%
Height 50%
Height 75%
Height 100%
Height auto
                    
<div style="height: 100px;">
  <div class="h-25 p-3 d-inline-block bg-primary-subtle text-primary border border-primary">Height 25%</div>
  <div class="h-50 p-3 d-inline-block bg-primary-subtle text-primary border border-primary">Height 50%</div>
  <div class="h-75 p-3 d-inline-block bg-primary-subtle text-primary border border-primary">Height 75%</div>
  <div class="h-100 p-3 d-inline-block bg-primary-subtle text-primary border border-primary">Height 100%</div>
  <div class="h-auto p-3 d-inline-block bg-primary-subtle text-primary border border-primary">Height auto</div>
</div>

Text

Quickly style and customize text elements using text utilities—ideal for controlling font size, color, weight, alignment, and more.

Text alignment

Start aligned text on all viewport sizes.

Center aligned text on all viewport sizes.

End aligned text on all viewport sizes.

End aligned text on viewports sized SM (small) or wider.

End aligned text on viewports sized MD (medium) or wider.

End aligned text on viewports sized LG (large) or wider.

End aligned text on viewports sized XL (extra large) or wider.

End aligned text on viewports sized XXL (extra extra large) or wider.

                    
<p class="text-start">Start aligned text on all viewport sizes.</p>
<p class="text-center">Center aligned text on all viewport sizes.</p>
<p class="text-end">End aligned text on all viewport sizes.</p>

<p class="text-sm-end">End aligned text on viewports sized SM (small) or wider.</p>
<p class="text-md-end">End aligned text on viewports sized MD (medium) or wider.</p>
<p class="text-lg-end">End aligned text on viewports sized LG (large) or wider.</p>
<p class="text-xl-end">End aligned text on viewports sized XL (extra large) or wider.</p>
<p class="text-xxl-end">End aligned text on viewports sized XXL (extra extra large) or wider.</p>
Text transform

Lowercased text.

Uppercased text.

CapiTaliZed text.

                    
<p class="text-lowercase">Lowercased text.</p>
<p class="text-uppercase">Uppercased text.</p>
<p class="text-capitalize">CapiTaliZed text.</p>
Font size

.fs-1 text

.fs-2 text

.fs-3 text

.fs-4 text

.fs-5 text

.fs-6 text

                    
<p class="fs-1">.fs-1 text</p>
<p class="fs-2">.fs-2 text</p>
<p class="fs-3">.fs-3 text</p>
<p class="fs-4">.fs-4 text</p>
<p class="fs-5">.fs-5 text</p>
<p class="fs-6">.fs-6 text</p>
Font weight and italics

Bold text.

Bolder weight text (relative to the parent element).

Semibold weight text.

Medium weight text.

Normal weight text.

Light weight text.

Lighter weight text (relative to the parent element).

Italic text.

Text with normal font style

                    
<p class="fw-bold">Bold text.</p>
<p class="fw-bolder">Bolder weight text (relative to the parent element).</p>
<p class="fw-semibold">Semibold weight text.</p>
<p class="fw-medium">Medium weight text.</p>
<p class="fw-normal">Normal weight text.</p>
<p class="fw-light">Light weight text.</p>
<p class="fw-lighter">Lighter weight text (relative to the parent element).</p>
<p class="fst-italic">Italic text.</p>
<p class="fst-normal">Text with normal font style</p>
Line height

This is a long paragraph written to show how the line-height of an element is affected by our utilities. Classes are applied to the element itself or sometimes the parent element. These classes can be customized as needed with our utility API.

This is a long paragraph written to show how the line-height of an element is affected by our utilities. Classes are applied to the element itself or sometimes the parent element. These classes can be customized as needed with our utility API.

This is a long paragraph written to show how the line-height of an element is affected by our utilities. Classes are applied to the element itself or sometimes the parent element. These classes can be customized as needed with our utility API.

This is a long paragraph written to show how the line-height of an element is affected by our utilities. Classes are applied to the element itself or sometimes the parent element. These classes can be customized as needed with our utility API.

                    
<p class="lh-1">This is a long paragraph written to show how the line-height of an element is affected by our utilities. Classes are applied to the element itself or sometimes the parent element. These classes can be customized as needed with our utility API.</p>
<p class="lh-sm">This is a long paragraph written to show how the line-height of an element is affected by our utilities. Classes are applied to the element itself or sometimes the parent element. These classes can be customized as needed with our utility API.</p>
<p class="lh-base">This is a long paragraph written to show how the line-height of an element is affected by our utilities. Classes are applied to the element itself or sometimes the parent element. These classes can be customized as needed with our utility API.</p>
<p class="lh-lg">This is a long paragraph written to show how the line-height of an element is affected by our utilities. Classes are applied to the element itself or sometimes the parent element. These classes can be customized as needed with our utility API.</p>
Text decoration

This text has a line underneath it.

This text has a line going through it.

This link has its text decoration removed 
                    
<p class="text-decoration-underline">This text has a line underneath it.</p>
<p class="text-decoration-line-through">This text has a line going through it.</p>
<a href="#" class="text-decoration-none">This link has its text decoration removed</a>