Default buttons

Button styles can be applied to anything with the .btn class applied. However, typically you'll want to apply these to only <a> and <button> elements for the best rendering.

Button	class=""	Description
Default	btn btn-default	Standard gray button with gradient
Primary	btn btn-primary	Provides extra visual weight and identifies the primary action in a set of buttons
Info	btn btn-info	Used as an alternative to the default styles
Success	btn btn-success	Indicates a successful or positive action
Warning	btn btn-warning	Indicates caution should be taken with this action
Danger	btn btn-danger	Indicates a dangerous or potentially negative action
Inverse	btn btn-inverse	Alternate dark gray button, not tied to a semantic action or use
Link	btn btn-link	Deemphasize a button by making it look like a link while maintaining button behavior

Cross browser compatibility

IE9 doesn't crop background gradients on rounded corners, so we remove it. Related, IE9 jankifies disabled button elements, rendering text gray with a nasty text-shadow that we cannot fix.

Button sizes

Fancy larger or smaller buttons? Add .btn-large, .btn-small, or .btn-mini for additional sizes.

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

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

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

Disabled state

Make buttons look unclickable by fading them back 50%.

Anchor element

Add the .disabled class to <a> buttons.

Primary link Link

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

Heads up! We use .disabled as a utility class here, similar to the common .active class, so no prefix is required. Also, this class is only for aesthetic; you must use custom JavaScript to disable links here.

Button element

Add the disabled attribute to <button> buttons.

Primary button Button

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

One class, multiple tags

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

Link Button

<a class="btn btn-default" href="/kallyas_joomla/">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">

As a best practice, try to match the element for your context to ensure matching cross-browser rendering. If you have an input, use an <input type="submit"> for your button.