Buttons

Options

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

<!-- Standard gray 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>

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">Primary link</a>
							<a href="#" class="btn btn-default btn-lg disabled">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.

Button tags

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

Link 
<a class="btn btn-default" href="#">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.