Default Button
                                            Use the button classes on an <a>,<button>,or <input>element.
                                        
Outline Button
                                            Use the .btn-outline-*classes to quickly create bordered buttons.
                                        
Rounded Button
                                            Add .btn-roundedto buttons to get large rounded corners.
                                        
Rounded Outline Button
                                            Use the .btn-outline-*and .btn-roundedclasses together to quickly create bordered buttons with large rounded corners.
                                        
Add icons to any button or even use Icon-only buttons.
                                            Add .btn-lgor .btn-smclasses for additional button sizes.
                                        
                                            Add the disabledattribute to disable buttons.
                                        
                                            Create block level buttons,by adding add .btn-block.
                                        
                                            Create a group of buttons by wrapping with .btn-group.