Any single .btn can be turned into a dropdown
                                    toggle with some markup changes. Here’s how you can put them to work
                                    with either <button>
                                    elements:
The best part is you can do this with any button variant, too:
The best part is you can do this with any button variant, too:
Button dropdowns work with buttons of all sizes, including default and split dropdown buttons.
Trigger dropdown menus above elements
                                    by adding .dropup to the parent
                                    element.
Add .dropdown-menu-right
                                    to a .dropdown-menu to right
                                    align the dropdown menu.
Trigger dropdown menus at the right of the elements by adding .dropright to the parent element.
                                
Trigger dropdown menus at the right of the elements by adding .dropleft to the parent element.