Use button classes on an <a>, <button>, or <input> element.
Use the .btn-outline-* classes to create bordered buttons.
Add rounded to buttons to get large rounded corners.
Use the .btn-outline-* and .btn-rounded classes together to quickly create bordered buttons with large rounded corners.
Add .btn-lg or .btn-sm classes for additional button sizes.
Add icons to any button or even use Icon-only buttons.
Create block level buttons, by adding add .btn-block.
Create a group of buttons by wrapping with .btn-group.
Add the disabled attribute to disable buttons.