Basic Dropdown
A dropdown menu is a toggleable menu that allows the user to choose one value from a predefined list
Dropdown Divider
                                        The .dropdown-dividerclass is used to separate links inside the dropdown menu with a thin horizontal border
                                    
Dropdown Header
                                        The .dropdown-headerclass is used to add headers inside the dropdown menu
                                    
Disable and Active items
                                        The .dropdown-headerclass is used to add headers inside the dropdown menu
                                    
Align Right
                                        To right-align the dropdown,add the .dropdown-menu-rightclass to the element with .dropdown-menu
                                    
Dropup
                                        The .dropupclass makes the dropdown menu expand upwards instead of downwards
                                    
Dropright
                                        Trigger dropdown menus at the right of the elements by adding .droprightto the parent element
                                    
Dropleft
                                        Trigger dropdown menus at the right of the elements by adding .dropleft to the parent element
                                    
Button Dropdowns
Sizing
Button dropdowns work with buttons of all sizes,including default and split dropdown buttons.
Custom style
                                        Use .custom-dropdownthis class for this style
                                    


 
                                                 
                                                 
                                                 
                                                