Buttons
Examples
Bootstrap includes six predefined button styles, each serving its own semantic purpose.
Sizes
Fancy larger or smaller buttons? Add .btn-lg or .btn-sm for additional sizes.
Outline buttons
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.
Button 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).
Disabled Buttons
Make buttons look inactive by adding the disabled boolean attribute to any <button> element.
Disabled Link
Disabled buttons using the <a> element behave a bit different:
Block Buttons
Create block level buttons—those that span the full width of a parent—by adding .btn-block.
Toggle states
Add data-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>.
Checkbox buttons
Bootstrap’s .button styles can be applied to other elements, such as <label>s, to provide checkbox or radio style button toggling. Add data-toggle="buttons" to a .btn-group containing those modified buttons to enable toggling in their respective styles.
Radio buttons
Bootstrap’s .button styles can be applied to other elements, such as <label>s, to provide checkbox or radio style button toggling. Add data-toggle="buttons" to a .btn-group containing those modified buttons to enable toggling in their respective styles.
Input With Button Groups
Feel free to mix input groups with button groups in your toolbars. Similar to the example above, you’ll likely need some utilities though to space things properly..
Button Groups
Place a .btn-group within another .btn-group when you want dropdown menus mixed with a series of buttons.Make a set of buttons appear vertically stacked rather than horizontally.
Icon With Label Buttons
A button variant for using icon with label.
Only Icon Buttons
A button variant for using only icons.