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Use any of the available button classes to quickly create a styled button.

<!-- Standard button --> <button type="button" class="btn btn-default">Default</button>  <!-- Provides extra visual weight and identifies the primary action in a set of buttons --> <button type="button" class="btn btn-primary">Primary</button>  <!-- Indicates a successful or positive action --> <button type="button" class="btn btn-success">Success</button>  <!-- Contextual button for informational alert messages --> <button type="button" class="btn btn-info">Info</button>  <!-- Indicates caution should be taken with this action --> <button type="button" class="btn btn-warning">Warning</button>  <!-- Indicates a dangerous or potentially negative action --> <button type="button" class="btn btn-danger">Danger</button>  <!-- Deemphasize a button by making it look like a link while maintaining button behavior --> <button type="button" class="btn btn-link">Link</button> 

Sizes

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

<p>   <button type="button" class="btn btn-primary btn-lg">Large button</button>   <button type="button" class="btn btn-default btn-lg">Large button</button> </p> <p>   <button type="button" class="btn btn-primary">Default button</button>   <button type="button" class="btn btn-default">Default button</button> </p> <p>   <button type="button" class="btn btn-primary btn-sm">Small button</button>   <button type="button" class="btn btn-default btn-sm">Small button</button> </p> <p>   <button type="button" class="btn btn-primary btn-xs">Extra small button</button>   <button type="button" class="btn btn-default btn-xs">Extra small button</button> </p> 

Create block level buttons—those that span the full width of a parent— by adding .btn-block.

<button type="button" class="btn btn-primary btn-lg btn-block">Block level button</button> <button type="button" class="btn btn-default btn-lg btn-block">Block level button</button> 

Active state

Buttons will appear pressed (with a darker background, darker border, and inset shadow) when active. For <button> elements, this is done via :active. For <a> elements, it’s done with .active. However, you may use .active <button>s should you need to replicate the active state progammatically.

Button element

No need to add :active as it’s a pseudo-class, but if you need to force the same appearance, go ahead and add .active.

<button type="button" class="btn btn-primary btn-lg active">Primary button</button> <button type="button" class="btn btn-default btn-lg active">Button</button> 

Anchor element

Add the .active class to <a> buttons.

Primary link Link

<a href="#" class="btn btn-primary btn-lg active" role="button">Primary link</a> <a href="#" class="btn btn-default btn-lg active" role="button">Link</a> 

Disabled state

Make buttons look unclickable by fading them back 50%.

Button element

Add the disabled attribute to <button> buttons.

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

Cross-browser compatibility

If you add the disabled attribute to a <button>, Internet Explorer 9 and below will render text gray with a nasty text-shadow that we cannot fix.

Anchor element

Add the .disabled class to <a> buttons.

Primary link Link

<a href="#" class="btn btn-primary btn-lg disabled" role="button">Primary link</a> <a href="#" class="btn btn-default btn-lg disabled" role="button">Link</a> 

We use .disabled as a utility class here, similar to the common .active class, so no prefix is required.

Link functionality not impacted

This class will only change the <a>‘s appearance, not its functionality. Use custom JavaScript to disable links here.

Context-specific usage

While button classes can be used on <a> and <button> elements, only <button> elements are supported within our nav and navbar components.

Button tags

Use the button classes on an <a>, <button>, or <input> element.

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

Cross-browser rendering

As a best practice, we highly recommend using the <button> element whenever possible to ensure matching cross-browser rendering.

Among other things, there’s a Firefox bug that prevents us from setting the line-height of <input>-based buttons, causing them to not exactly match the height of other buttons on Firefox.



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