.dropdown, or another element that declares
position: relative;.
To create a right-aligned dropdown menu, add the .dropdown-menu-right class to the .dropdown-menu.
<div class="dropdown-menu dropdown-menu-right">
...
</div>
A dropdown menu item can contain a label, just place the .label within the dropdown menu item.
Use the .col-sm-*, .col-md-* and
.col-lg-* classes to specify breakpoints.
To use dropdowns, you need to require the dropdown plugin:
require(['px-bootstrap/dropdown']);
To use dropdowns, you need to include ui-bootstrap.js script:
<script src="path/to/js/ui-bootstrap.js"></script>