#### 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

#### Icon dropdowns

Replace button with icon buttons

#### Dropup variation

Add class `.dropup`

#### Dropdown sizes

Add class `.btn-{size}` to dropdown buttons