Buttons

Bootstrap 5 Button component

Responsive Buttons built with Bootstrap 5. Multiple predefined button style classes: button link, outline, round button, social, floating, fixed & more

Use MDB custom button styles for actions in forms, dialogs, and more with support for multiple sizes, states, and more.

Note: Read the API tab to find all available options and advanced customization

Video tutorial

MDB 5 - Bootstrap 5 & Material Design Buttons Tutorial

Basic example

Use default button style to indicate an action or link within your website.

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            <button type="button" class="btn btn-primary">Button</button>

Disable text wrapping

If you don’t want the button text to wrap, you can add the .text-nowrap class to the button. In Sass, you can set $btn-white-space: nowrap to disable text wrapping for each button.

Hierarchy

Buttons, as one of the key UI elements, must have their own hierarchy. This means that the user should be able to easily identify which button is the most important (primary button), which is less important (secondary button) and which presents completely additional information (tertiary button).

Elements with strong, filled backgrounds and shadows attract attention the most, which is why button primary is built in this way.

A delicate background without shadows is less engaging, so it is well suited for button secondary.

The lack of background and shadow makes the element the least visible. These features characterize the button tertiary.

Note: Button tertiary may require additional margins. Without extra margins, the button edge will be flush with adjacent elements (which is sometimes the desired result). If you need margin - simply add margin utility classes like mx-2.

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            <button type="button" class="btn btn-primary">Primary</button>
            <button type="button" class="btn btn-secondary">Secondary</button>
            <button type="button" class="btn btn-tertiary" data-mdb-ripple-color="light">Tertiary</button>

Contextual

MDB includes several predefined button styles, each serving its own semantic purpose.

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            <button type="button" class="btn btn-success">Success</button>
            <button type="button" class="btn btn-danger">Danger</button>
            <button type="button" class="btn btn-warning">Warning</button>
            <button type="button" class="btn btn-info">Info</button>

Conveying meaning to assistive technologies:
Using color to add meaning only provides a visual indication, which will not be conveyed to users of assistive technologies – such as screen readers. Ensure that information denoted by the color is either obvious from the content itself (e.g. the visible text), or is included through alternative means, such as additional text hidden with the .visually-hidden class.

Neutral

Neutral buttons provide additional light and dark colors.

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            <button type="button" class="btn btn-light" data-mdb-ripple-color="dark">Light</button>
            <button type="button" class="btn btn-dark">Dark</button>

Outline

In need of a button, but not the hefty background colors they bring? Replace the default modifier classes with the .btn-outline-* ones to remove all background images and colors on any button.

In the outline buttons, we recommend adding data-mdb-ripple-color="dark" to change the color of the ripple effect. The default light color of the ripple (applied automatically to every button) may not be well visible in the case of light and outline buttons.

To learn more about the ripple effect and all the available options have a look at Ripple Docs.

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            <button type="button" class="btn btn-outline-primary" data-mdb-ripple-color="dark">Primary</button>
            <button type="button" class="btn btn-outline-secondary" data-mdb-ripple-color="dark">Secondary</button>
            <button type="button" class="btn btn-outline-success" data-mdb-ripple-color="dark">Success</button>
            <button type="button" class="btn btn-outline-danger" data-mdb-ripple-color="dark">Danger</button>
            <button type="button" class="btn btn-outline-warning" data-mdb-ripple-color="dark">Warning</button>
            <button type="button" class="btn btn-outline-info" data-mdb-ripple-color="dark">Info</button>
            <button type="button" class="btn btn-outline-light" data-mdb-ripple-color="dark">Light</button>
            <button type="button" class="btn btn-outline-dark" data-mdb-ripple-color="dark">Dark</button>

Some of the button styles use a relatively light foreground color, and should only be used on a dark background in order to have sufficient contrast.

Rounded

Add .btn-rounded class to make the button rounded.

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            <button type="button" class="btn btn-primary btn-rounded">Primary</button>
            <button type="button" class="btn btn-secondary btn-rounded">Secondary</button>
            <button type="button" class="btn btn-success btn-rounded">Success</button>
            <button type="button" class="btn btn-danger btn-rounded">Danger</button>
            <button type="button" class="btn btn-warning btn-rounded">Warning</button>
            <button type="button" class="btn btn-info btn-rounded">Info</button>
            <button type="button" class="btn btn-light btn-rounded">Light</button>
            <button type="button" class="btn btn-dark btn-rounded">Dark</button>

Rounded outline

You can use .btn-outline-* and .btn-rounded together to make the button outline and rounded at the same time.

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            <button type="button" class="btn btn-outline-primary btn-rounded" data-mdb-ripple-color="dark">Primary</button>
            <button type="button" class="btn btn-outline-secondary btn-rounded" data-mdb-ripple-color="dark">Secondary</button>
            <button type="button" class="btn btn-outline-success btn-rounded" data-mdb-ripple-color="dark">Success</button>
            <button type="button" class="btn btn-outline-danger btn-rounded" data-mdb-ripple-color="dark">Danger</button>
            <button type="button" class="btn btn-outline-warning btn-rounded" data-mdb-ripple-color="dark">Warning</button>
            <button type="button" class="btn btn-outline-info btn-rounded" data-mdb-ripple-color="dark">Info</button>
            <button type="button" class="btn btn-outline-light btn-rounded" data-mdb-ripple-color="dark">Light</button>
            <button type="button" class="btn btn-outline-dark btn-rounded" data-mdb-ripple-color="dark">Dark</button>

Floating

Use .btn-floating class to make a circle button.

To make it works properly you have to put an icon inside. The text will not fit in. You can find hundreds of available icons in our icons docs.

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            <button type="button" class="btn btn-primary btn-floating">
              <i class="fas fa-download"></i>
            </button>

You can apply almost all the same classes and attributes to the floating buttons as to the regular buttons - colors, ripples, sizes, outline, etc.

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            <button type="button" class="btn btn-primary btn-lg btn-floating">
              <i class="fas fa-gem"></i>
            </button>
            <button type="button" class="btn btn-outline-success btn-floating" data-mdb-ripple-color="dark">
              <i class="fas fa-star"></i>
            </button>
            <button type="button" class="btn btn-danger btn-floating">
              <i class="fas fa-magic"></i>
            </button>
            <button type="button" class="btn btn-dark btn-floating">
              <i class="fab fa-apple"></i>
            </button>

Fixed buttons

Use .fixed-action-btn class to create a fixed button with a list of available options that shows on hover or click.

See the live example of a fixed button in the bottom right corner of this page.

Note: There are available show/hide methods to manually open and close the list. Read the API tab to find more info.

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          <div class="fixed-action-btn" id="fixed1">
            <a class="btn btn-floating text-white btn-lg" style="background-color: #f44336;">
              <i class="fas fa-pencil-alt"></i>
            </a>

            <ul class="list-unstyled">
              <li>
                <a class="btn text-white btn-floating btn-lg" style="background-color: #f44336;">
                  <i class="fas fa-star"></i>
                </a>
              </li>
              <li>
                <a class="btn text-white btn-floating btn-lg" style="background-color: #fdd835;">
                  <i class="fas fa-user"></i>
                </a>
              </li>
              <li>
                <a class="btn text-white btn-floating btn-lg" style="background-color: #4caf50;">
                  <i class="fas fa-envelope"></i>
                </a>
              </li>
              <li>
                <a class="btn text-white btn-floating btn-lg" style="background-color: #2196f3;">
                  <i class="fas fa-shopping-cart"></i>
                </a>
              </li>
            </ul>
          </div>
        
        
    
        
            
            <div class="fixed-action-btn">
              <a class="btn btn-floating text-white btn-lg" style="background-color: #f44336">
                <i class="fas fa-pencil-alt"></i>
              </a>

              <ul class="list-unstyled">
                <li>
                  <a class="btn text-white btn-floating btn-lg" style="background-color: #f44336">
                    <i class="fas fa-star"></i>
                  </a>
                </li>
                <li>
                  <a class="btn text-white btn-floating btn-lg" style="background-color: #fdd835">
                    <i class="fas fa-user"></i>
                  </a>
                </li>
                <li>
                  <a class="btn text-white btn-floating btn-lg" style="background-color: #4caf50">
                    <i class="fas fa-envelope"></i>
                  </a>
                </li>
                <li>
                  <a class="btn text-white btn-floating btn-lg" style="background-color: #2196f3">
                    <i class="fas fa-shopping-cart"></i>
                  </a>
                </li>
              </ul>
            </div>

Social

Combining our icons and custom colors you can create social buttons. See all available icons in our icons search (check "brands" to filter brand icons).

Note: If you use custom colors you need to remove our predefined color classes like .btn-primary or .btn-danger. Instead of this, you need to add class .text-white>.

In the example below, we place a Facebook icon <i class="fab fa-facebook-f"></i> inside the button and set a background-color to #3B5998 (facebook brand color).

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            <a class="btn text-white" style="background-color: #3b5998;" href="#!" role="button">
              <i class="fab fa-facebook-f"></i>
            </a>

Sample brands

A few the most popular brands in form of social buttons.

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            <!-- Facebook -->
            <a class="btn text-white" style="background-color: #3b5998;" href="#!" role="button">
              <i class="fab fa-facebook-f"></i>
            </a>

            <!-- Twitter -->
            <a class="btn text-white" style="background-color: #55acee;" href="#!" role="button">
              <i class="fab fa-twitter"></i>
            </a>

            <!-- Google -->
            <a class="btn text-white" style="background-color: #dd4b39;" href="#!" role="button">
              <i class="fab fa-google"></i>
            </a>

            <!-- Instagram -->
            <a class="btn text-white" style="background-color: #ac2bac;" href="#!" role="button">
              <i class="fab fa-instagram"></i>
            </a>

            <!-- Linkedin -->
            <a class="btn text-white" style="background-color: #0082ca;" href="#!" role="button">
              <i class="fab fa-linkedin-in"></i>
            </a>

            <!-- Pinterest -->
            <a class="btn text-white" style="background-color: #c61118;" href="#!" role="button">
              <i class="fab fa-pinterest"></i>
            </a>

            <!-- Vkontakte -->
            <a class="btn text-white" style="background-color: #4c75a3;" href="#!" role="button">
              <i class="fab fa-vk"></i>
            </a>

            <!-- Stack overflow -->
            <a class="btn text-white" style="background-color: #ffac44;" href="#!" role="button">
              <i class="fab fa-stack-overflow"></i>
            </a>

            <!-- Youtube -->
            <a class="btn text-white" style="background-color: #ed302f;" href="#!" role="button">
              <i class="fab fa-youtube"></i>
            </a>

            <!-- Slack -->
            <a class="btn text-white" style="background-color: #481449;" href="#!" role="button">
              <i class="fab fa-slack-hash"></i>
            </a>

            <!-- Github -->
            <a class="btn text-white" style="background-color: #333333;" href="#!" role="button">
              <i class="fab fa-github"></i>
            </a>

            <!-- Dribbble -->
            <a class="btn text-white" style="background-color: #ec4a89;" href="#!" role="button">
              <i class="fab fa-dribbble"></i>
            </a>

            <!-- Reddit -->
            <a class="btn text-white" style="background-color: #ff4500;" href="#!" role="button">
              <i class="fab fa-reddit-alien"></i>
            </a>

            <!-- Whatsapp -->
            <a class="btn text-white" style="background-color: #25d366;" href="#!" role="button">
              <i class="fab fa-whatsapp"></i>
            </a>

Floating social

By adding .btn-floating class you can create a nice, floating social button.

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            <a class="btn text-white btn-lg btn-floating" style="background-color: #ac2bac;" href="#!" role="button">
              <i class="fab fa-instagram"></i>
            </a>

Text

You don't need to use only an icon. You can add text to the button. Remember to add some spacing classes (for example .me-2) to provide a proper space between icon and text.

Twitter
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            <a class="btn text-white" style="background-color: #55acee;" href="#!" role="button">
              <i class="fab fa-twitter me-2"></i>
              Twitter
            </a>

Only icon

By removing button classes and replacing background-color with color you can create minimalistic, clickable icons.

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              <!-- Facebook -->
              <a style="color: #3b5998;" href="#!" role="button">
                <i class="fab fa-facebook-f fa-lg"></i>
              </a>

              <!-- Twitter -->
              <a style="color: #55acee;" href="#!" role="button">
                <i class="fab fa-twitter fa-lg"></i>
              </a>

              <!-- Google -->
              <a style="color: #dd4b39;" href="#!" role="button">
                <i class="fab fa-google fa-lg"></i>
              </a>

              <!-- Instagram -->
              <a style="color: #ac2bac;" href="#!" role="button">
                <i class="fab fa-instagram fa-lg"></i>
              </a>

Notifications

By using a badge you can create a button with a notification to provide a counter.

8
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                <a class="btn text-white" style="background-color: #3b5998;" href="#!" role="button">
                  <i class="fab fa-facebook-f"></i>
                  <span class="badge bg-danger ms-2">8</span>
                </a>

Tags

The .btn classes are designed to be used with the <button> element. However, you can also use these classes on <a> or <input> elements (though some browsers may apply a slightly different rendering).

When using button classes on <a> elements that are used to trigger in-page functionality (like collapsing content), rather than linking to new pages or sections within the current page, these links should be given a role="button" to appropriately convey their purpose to assistive technologies such as screen readers.

Link
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                <a class="btn btn-primary" href="#" role="button">Link</a>
                <button class="btn btn-primary" type="submit">Button</button>
                <input class="btn btn-primary" type="button" value="Input" />
                <input class="btn btn-primary" type="submit" value="Submit" />
                <input class="btn btn-primary" type="reset" value="Reset" />

Sizes

Fancy larger or smaller buttons? Add .btn-lg or .btn-sm for additional sizes.

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                <button type="button" class="btn btn-primary btn-sm">Button</button>
                <button type="button" class="btn btn-primary">Button</button>
                <button type="button" class="btn btn-primary btn-lg">Button</button>

Active state

Add .active class to make the button look pressed.

Primary link Link
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                <a href="#" class="btn btn-primary btn-lg active" role="button" aria-pressed="true">Primary link</a>
                <a href="#" class="btn btn-secondary btn-lg active" role="button" aria-pressed="true">Link</a>

Disabled state

Make buttons look inactive by adding the disabled boolean attribute to any <button> element. Disabled buttons have pointer-events: none applied to, preventing hover and active states from triggering.

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                <button type="button" class="btn btn-primary btn-lg" disabled>Primary button</button>
                <button type="button" class="btn btn-secondary btn-lg" disabled>Button</button>

Disabled buttons using the <a> element behave a bit different:

  • <a>s don’t support the disabled attribute, so you must add the .disabled class to make it visually appear disabled.
  • Some future-friendly styles are included to disable all pointer-events on anchor buttons. In browsers which support that property, you won’t see the disabled cursor at all.
  • Disabled buttons using <a> should include the aria-disabled="true" attribute to indicate the state of the element to assistive technologies.
  • Disabled buttons using <a> should not include the href attribute.
Primary link Link
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                <a class="btn btn-primary btn-lg disabled" role="button" aria-disabled="true">Primary link</a>
                <a class="btn btn-secondary btn-lg disabled" role="button" aria-disabled="true">Link</a>

Link functionality caveat:
To cover cases where you have to keep the href attribute on a disabled link, the .disabled class uses pointer-events: none to try to disable the link functionality of <a>s. Note that this CSS property is not yet standardized for HTML, but all modern browsers support it. In addition, even in browsers that do support pointer-events: none, keyboard navigation remains unaffected, meaning that sighted keyboard users and users of assistive technologies will still be able to activate these links. So to be safe, in addition to aria-disabled="true", also include a tabindex="-1" attribute on these links to prevent them from receiving keyboard focus, and use custom JavaScript to disable their functionality altogether.

Primary link Link
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                <a href="#" class="btn btn-primary btn-lg disabled" tabindex="-1" role="button" aria-disabled="true">Primary link</a>
                <a href="#" class="btn btn-secondary btn-lg disabled" tabindex="-1" role="button" aria-disabled="true">Link</a>

Block buttons

Create responsive stacks of full-width, “block buttons” like those in Bootstrap 4 with a mix of our display and gap utilities. By using utilities instead of button specific classes, we have much greater control over spacing, alignment, and responsive behaviors.

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                <div class="d-grid gap-2">
                  <button class="btn btn-primary" type="button">Button</button>
                  <button class="btn btn-primary" type="button">Button</button>
                </div>

Here we create a responsive variation, starting with vertically stacked buttons until the md breakpoint, where .d-md-block replaces the .d-grid class, thus nullifying the gap-2 utility. Resize your browser to see them change.

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                <div class="d-grid gap-2 d-md-block">
                  <button class="btn btn-primary" type="button">Button</button>
                  <button class="btn btn-primary" type="button">Button</button>
                </div>

You can adjust the width of your block buttons with grid column width classes. For example, for a half-width “block button”, use .col-6. Center it horizontally with .mx-auto, too.

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                <div class="d-grid gap-2 col-6 mx-auto">
                  <button class="btn btn-primary" type="button">Button</button>
                  <button class="btn btn-primary" type="button">Button</button>
                </div>

Additional utilities can be used to adjust the alignment of buttons when horizontal. Here we’ve taken our previous responsive example and added some flex utilities and a margin utility on the button to right align the buttons when they’re no longer stacked.

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                <div class="d-grid gap-2 d-md-flex justify-content-md-end">
                  <button class="btn btn-primary me-md-2" type="button">Button</button>
                  <button class="btn btn-primary" type="button">Button</button>
                </div>

Toggle states

Add data-mdb-toggle="button" to toggle a button’s active state. If you’re pre-toggling a button, you must manually add the .active class and aria-pressed="true" to the <button>.

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                <button type="button" class="btn btn-primary" data-mdb-toggle="button" autocomplete="off">
                  Toggle button
                </button>
                <button type="button" class="btn btn-primary active" data-mdb-toggle="button" autocomplete="off" aria-pressed="true">
                  Active toggle button
                </button>
                <button type="button" class="btn btn-primary" disabled data-mdb-toggle="button" autocomplete="off">
                  Disabled toggle button
                </button>
Toggle link Active toggle link Disabled toggle link
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                <a href="#" class="btn btn-primary" role="button" data-mdb-toggle="button">Toggle link</a>
                <a href="#" class="btn btn-primary active" role="button" data-mdb-toggle="button" aria-pressed="true">Active toggle link</a> 
                <a class="btn btn-primary disabled" role="button" data-mdb-toggle="button">Disabled toggle link</a>

Buttons - API

Usage

Via data attributes

For all buttons except fixed buttons

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          <button class="btn btn-primary">
            Example button
          </button>

Via JavaScript

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          const exampleEl = document.querySelector('example');
          const myButton = new mdb.Button(exampleEl);

Via jQuery

Note: By default, MDB does not include jQuery and you have to add it to the project on your own.

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          $(document).ready(() => {
            $('#exampleID').button('methodName');
          });

Methods

Method Description Example
dispose Destroys an element's button. instance.dispose()
getInstance Static method which allows you to get the button instance associated to a DOM element. Button.getInstance(button)
getOrCreateInstance Static method which returns a button instance associated to a DOM element or create a new one in case it wasn't initialized. Button.getOrCreateInstance(button)
toggle Toggles push state. Gives the button the appearance that it has been activated. instance.toggle()
show Manually opens fixed button list. instance.show()
hide Manually hides fixed button list. instance.hide()

For example, to toggle all buttons

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          const buttons = document.querySelectorAll('.btn')
          buttons.forEach((button) => {
            const button = new mdb.Button(button)
            button.toggle()
          })

Events

Name Description
show.mdb.button This event fires immediately when the fixed button show method has been called.
shown.mdb.button This event is fired when a fixed button list has been made visible to the user (will wait for CSS transitions to complete).
hide.mdb.button This event is fired immediately when the fixed button hide method has been called.
hidden.mdb.button This event is fired when a fixed button list has been hidden from the user (will wait for CSS transitions to complete).
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          const myFixedButton = document.getElementById('myFixedButton')
          myFixedButton.addEventListener('show.mdb.button', function (e) {
            // do something...
          })

Import

MDB UI KIT also works with module bundlers. Use the following code to import this component:

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          import { Button } from 'mdb-ui-kit';

CSS variables

As part of MDB’s evolving CSS variables approach, buttons now use local CSS variables on .btn for enhanced real-time customization. Values for the CSS variables are set via Sass, so Sass customization is still supported, too.

Button's CSS variables are in different classes which belong to this component. To make it easier to use them, you can find below all of the used CSS variables.

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        // .btn
        --#{$prefix}btn-padding-x: #{$btn-padding-x};
        --#{$prefix}btn-padding-top: #{$btn-padding-top};
        --#{$prefix}btn-padding-bottom: #{$btn-padding-bottom};
        --#{$prefix}btn-font-family: #{$btn-font-family};
        @include rfs($btn-font-size, --#{$prefix}btn-font-size);
        --#{$prefix}btn-font-weight: #{$btn-font-weight};
        --#{$prefix}btn-line-height: #{$btn-line-height};
        --#{$prefix}btn-color: #{$body-color};
        --#{$prefix}btn-bg: transparent;
        --#{$prefix}btn-border-width: 0;
        --#{$prefix}btn-border-color: none;
        --#{$prefix}btn-border-radius: #{$btn-border-radius};
        --#{$prefix}btn-hover-border-color: transparent;
        --#{$prefix}btn-box-shadow: #{$btn-box-shadow};
        --#{$prefix}btn-hover-box-shadow: #{$btn-hover-box-shadow};
        --#{$prefix}btn-focus-box-shadow: #{$btn-focus-box-shadow};
        --#{$prefix}btn-active-box-shadow: #{$btn-active-box-shadow};
        --#{$prefix}btn-disabled-opacity: #{$btn-disabled-opacity};
        
        // [class*='btn-outline-']
        --#{$prefix}btn-padding-top: #{$btn-outline-padding-top};
        --#{$prefix}btn-padding-bottom: #{$btn-outline-padding-bottom};
        --#{$prefix}btn-padding-x: #{$btn-outline-padding-x};
        --#{$prefix}btn-border-width: #{$btn-outline-border-width};
        --#{$prefix}btn-line-height: #{$btn-line-height};
        
        // .btn-link
        --#{$prefix}btn-font-weight: #{$font-weight-medium};
        --#{$prefix}btn-color: #{$btn-link-color};
        --#{$prefix}btn-bg: transparent;
        --#{$prefix}btn-border-color: transparent;
        --#{$prefix}btn-hover-color: #{$btn-link-hover-color};
        --#{$prefix}btn-hover-bg: #{$btn-link-hover-bg};
        --#{$prefix}btn-hover-border-color: transparent;
        --#{$prefix}btn-focus-color: #{$btn-link-focus-color};
        --#{$prefix}btn-active-color: #{$btn-link-active-color};
        --#{$prefix}btn-active-border-color: transparent;
        --#{$prefix}btn-disabled-color: #{$btn-link-disabled-color};
        --#{$prefix}btn-disabled-border-color: transparent;
        --#{$prefix}btn-box-shadow: none;
        --#{$prefix}btn-focus-shadow-rgb: #{to-rgb(mix(color-contrast($primary), $primary, 15%))};
        
        // .btn-tertiary
        --#{$prefix}btn-font-weight: #{$font-weight-medium};
        --#{$prefix}btn-color: #{$btn-link-color};
        --#{$prefix}btn-hover-color: #{$btn-link-hover-color};
        --#{$prefix}btn-hover-bg: transparent;
        --#{$prefix}btn-focus-color: #{$btn-link-focus-color};
        --#{$prefix}btn-active-color: #{$btn-link-active-color};
        --#{$prefix}btn-disabled-color: #{$btn-link-disabled-color};
        --#{$prefix}btn-box-shadow: none;
        
        // .btn-rounded
        --#{$prefix}btn-border-radius: #{$btn-rounded-border-radius};
        
        // .btn-floating,
        // [class*='btn-outline-'].btn-floating
        --#{$prefix}btn-border-radius: #{$btn-floating-border-radius};
        
        // .btn-floating
        --#{$prefix}btn-width: #{$btn-floating-width};
        --#{$prefix}btn-height: #{$btn-floating-height};
        --#{$prefix}btn-icon-width: #{$btn-floating-icon-width};
        --#{$prefix}btn-icon-line-height: #{$btn-floating-icon-line-height};
        --#{$prefix}btn-width-lg: #{$btn-floating-width-lg};
        --#{$prefix}btn-height-lg: #{$btn-floating-height-lg};
        --#{$prefix}btn-icon-width-lg: #{$btn-floating-icon-width-lg};
        --#{$prefix}btn-icon-line-height-lg: #{$btn-floating-icon-line-height-lg};
        --#{$prefix}btn-width-sm: #{$btn-floating-width-sm};
        --#{$prefix}btn-height-sm: #{$btn-floating-height-sm};
        --#{$prefix}btn-icon-width-sm: #{$btn-floating-icon-width-sm};
        --#{$prefix}btn-icon-line-height-sm: #{$btn-floating-icon-line-height-sm};
        
        // [class*='btn-outline-'].btn-floating
        --#{$prefix}btn-icon-width: #{$btn-outline-floating-icon-width};
        --#{$prefix}btn-icon-width-lg: #{$btn-outline-floating-icon-width-lg};
        --#{$prefix}btn-icon-width-sm: #{$btn-outline-floating-icon-width-sm};
        --#{$prefix}btn-icon-line-height: #{$btn-outline-floating-icon-line-height};
        --#{$prefix}btn-icon-line-height-lg: #{$btn-outline-floating-icon-line-height-lg};
        --#{$prefix}btn-icon-line-height-sm: #{$btn-outline-floating-icon-line-height-sm};
        
        // .fixed-action-btn
        --#{$prefix}btn-right: #{$fixed-action-btn-right};
        --#{$prefix}btn-bottom: #{$fixed-action-btn-bottom};
        --#{$prefix}btn-zindex: #{$fixed-action-button-zindex};
        --#{$prefix}btn-padding-top: #{$fixed-action-btn-padding-top};
        --#{$prefix}btn-padding-bottom: #{$fixed-action-btn-padding-bottom};
        --#{$prefix}btn-padding-x: #{$fixed-action-btn-padding-x};
        --#{$prefix}btn-margin-bottom: #{$fixed-action-btn-li-margin-bottom};
        
        // .btn-block
        --#{$prefix}btn-margin-top: #{$btn-block-margin-top};

SCSS variables

Edit in sandbox 
        
            
        $btn-padding-top: 0.625rem;
        $btn-padding-bottom: 0.5rem;
        $btn-padding-x: 1.5rem;
        $btn-font-size: 0.75rem;
        $btn-line-height: 1.5;
        $btn-font-size: $input-btn-font-size;
        $btn-white-space: null;
        
        $btn-padding-top-lg: 0.75rem;
        $btn-padding-bottom-lg: 0.6875rem;
        $btn-padding-x-lg: 1.6875rem;
        $btn-font-size-lg: 0.875rem;
        $btn-line-height-lg: 1.6;
        
        $btn-padding-top-sm: 0.375rem;
        $btn-padding-bottom-sm: 0.3125rem;
        $btn-padding-x-sm: 1rem;
        $btn-font-size-sm: 0.75rem;
        $btn-line-height-sm: 1.5;
        
        $btn-border-width: $border-width-alternate;
        
        $btn-font-weight: $font-weight-medium;
        $btn-box-shadow: 0 4px 9px -4px rgba($black, 0.35);
        $btn-hover-box-shadow: 0 8px 9px -4px rgba($black, 0.15), 0 4px 18px 0 rgba($black, 0.1);
        $btn-focus-box-shadow: $btn-hover-box-shadow;
        $btn-active-box-shadow: $btn-focus-box-shadow;
        $btn-focus-width: $input-btn-focus-width;
        $btn-disabled-opacity: 0.65;
        
        $btn-link-color: $link-color;
        $btn-link-hover-color: $link-hover-color;
        $btn-link-focus-color: $link-focus-color;
        $btn-link-active-color: $link-active-color;
        $btn-link-disabled-color: $gray-500;
        $btn-link-hover-bg: hsl(0, 0%, 96%);
        
        $btn-border-radius: $border-radius;
        
        $btn-transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out,
          border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
        
        $btn-hover-bg-shade-amount: 5%;
        $btn-focus-bg-shade-amount: 5%;
        $btn-active-bg-shade-amount: 10%;
        
        $btn-contextual-box-shadow: 0 4px 9px -4px;
        $btn-contextual-box-shadow-state-first-part: 0 8px 9px -4px;
        $btn-contextual-box-shadow-state-second-part: 0 4px 18px 0;
        
        $btn-outline-padding-top: 0.5rem;
        $btn-outline-padding-bottom: 0.375rem;
        $btn-outline-padding-x: 1.375rem;
        $btn-outline-border-width: $border-width-alternate;
        $btn-outline-line-height: 1.5;
        
        $btn-outline-padding-top-lg: 0.625rem;
        $btn-outline-padding-bottom-lg: 0.5625rem;
        $btn-outline-padding-x-lg: 1.5625rem;
        $btn-outline-font-size-lg: 0.875rem;
        $btn-outline-line-height-lg: 1.6;
        
        $btn-outline-padding-top-sm: 0.25rem;
        $btn-outline-padding-bottom-sm: 0.1875rem;
        $btn-outline-padding-x-sm: 0.875rem;
        $btn-outline-font-size-sm: 0.75rem;
        $btn-outline-line-height-sm: 1.5;
        
        $btn-rounded-border-radius: 10rem;
        
        $btn-floating-border-radius: 50%;
        
        $btn-floating-width: 2.3125rem;
        $btn-floating-height: 2.3125rem;
        $btn-floating-icon-width: 2.3125rem;
        
        $btn-floating-width-lg: 2.8125rem;
        $btn-floating-height-lg: 2.8125rem;
        $btn-floating-icon-width-lg: 2.8125rem;
        
        $btn-floating-width-sm: 1.8125rem;
        $btn-floating-height-sm: 1.8125rem;
        $btn-floating-icon-width-sm: 1.8125rem;
        
        $btn-outline-floating-icon-width: 2.0625rem;
        $btn-outline-floating-icon-width-lg: 2.5625rem;
        $btn-outline-floating-icon-width-sm: 1.5625rem;
        
        $btn-floating-icon-line-height: 2.3125rem;
        $btn-floating-icon-line-height-lg: 2.8125rem;
        $btn-floating-icon-line-height-sm: 1.8125rem;
        
        $btn-outline-floating-icon-line-height: 2.0625rem;
        $btn-outline-floating-icon-line-height-lg: 2.5625rem;
        $btn-outline-floating-icon-line-height-sm: 1.5625rem;
        
        $fixed-action-btn-right: 2.1875rem;
        $fixed-action-btn-bottom: 2.1875rem;
        $fixed-action-btn-padding-top: 0.9375rem;
        $fixed-action-btn-padding-bottom: 1.25rem;
        $fixed-action-btn-padding-x: 1.25rem;
        $fixed-action-btn-li-margin-bottom: 1.5rem;
        
        $btn-block-margin-top: 0.5rem;