Basic dropdown

Wrap the dropdown’s toggle (your button or link) and the dropdown menu within .dropdown

Dropdown outline

Add class .btn-outline-{color} to the button inside .dropdown

Split button dropdowns

Wrap two buttons in .btn-group and add .dropdown-toggle-split to the toggling button

Dropup variation

Add class .dropup

Dropdown sizes

Add class .btn-{size} to dropdown buttons

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