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Bootstrap class: .dropdown-menu-right

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<div class="btn-group">
  <button type="button" class="btn btn-secondary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
    This dropdown's menu is right-aligned
  </button>
  <div class="dropdown-menu dropdown-menu-right">
    <button class="dropdown-item" type="button">Action</button>
    <button class="dropdown-item" type="button">Another action</button>
    <button class="dropdown-item" type="button">Something else here</button>
  </div>
</div>

Preview

Sass source

/* _dropdown.scss:36 */
.dropdown-menu-right {
  right: 0;
  left: auto;
}

Uses variables

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/* _dropdown.scss:36 */

More in Bootstrap Dropdowns