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 (though some browsers may apply a slightly different rendering).
Fancy larger or smaller buttons? Add .btn-lg or .btn-sm for additional sizes.
Block Buttons
Fancy larger or smaller buttons? Add .btn-lg or .btn-sm for additional sizes.
Active State Button
Buttons will appear pressed (with a darker background, darker border, and inset shadow) when active. There’s no need to add a class to <button>s as they use a pseudo-class. However, you can still force the same active appearance with .active (and include the aria-pressed="true" attribute) should you need to replicate the state programmatically.
Make buttons look inactive by adding the disabled boolean attribute to any <button> element.
Toggle State Buttons
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 andaria-pressed="true" to the <button>.
Checkbox Button
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 their toggling behavior via JavaScript and add .btn-group-toggle to style the <input>s within your buttons. Note that you can create single input-powered buttons or groups of them.
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 their toggling behavior via JavaScript and add .btn-group-toggle to style the <input>s within your buttons. Note that you can create single input-powered buttons or groups of them.
Button with Icon
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Rounded Button with Icon
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Button with Icon - Outline
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Rounded Button with Icon - Outline
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Social Buttons
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Social Buttons - Rounded
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