Examples
Bootstrap includes several predefined button styles, each serving its own semantic purpose, with a few extras thrown in for more control.
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.
Sizes
Fancy larger or smaller buttons? Add .btn-lg or
.btn-sm for additional sizes.
Checkbox and Radio Buttons
.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 their toggling behavior via JavaScript and add
.btn-group-toggle to style the <input>s within
your buttons.
Block Level Buttons
Create block level buttons—those that span the full
width of a parent—by adding .btn-block
Button toolbar
Combine sets of button groups into button toolbars for more complex components. Use utility classes as needed to space out groups, buttons, and more.
Rounded Button
Add .btn-rounded to default button to
get rounded corners.
Button Group Sizing
Instead of applying button sizing classes to every
button in a group, just add .btn-group-* to each
.btn-group, including each one when nesting multiple groups.
Nesting Button Group
Place a .btn-group within another
.btn-group when you want dropdown menus mixed with a series of
buttons.
Vertical Variation
Make a set of buttons appear vertically stacked rather than horizontally. Split button dropdowns are not supported here.