Options
Use any of the available button classes to quickly create a styled button.
Sizes
Fancy larger or smaller buttons? Add .btn-lg, .btn-sm, or .btn-xs for additional sizes.
Create block level buttons—those that span the full width of a parent— by adding .btn-block.
Button tags
Use the button classes on an <a>, <button>, or <input> element.
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.