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How do I adjust z-index using Bootstrap utilities to ensure my dropdown appears above a sticky header?

Asked on Dec 05, 2025

Answer

In Bootstrap 5, you can use utility classes to adjust the `z-index` of elements. To ensure a dropdown appears above a sticky header, you can use the `position-sticky` class for the header and adjust the `z-index` of both elements accordingly.

<!-- BEGIN COPY / PASTE -->
        <header class="position-sticky top-0 bg-light z-1">
            <!-- Sticky header content -->
            Sticky Header
        </header>
        <div class="dropdown">
            <button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-bs-toggle="dropdown" aria-expanded="false">
                Dropdown button
            </button>
            <ul class="dropdown-menu z-3" aria-labelledby="dropdownMenuButton">
                <li><a class="dropdown-item" href="#">Action</a></li>
                <li><a class="dropdown-item" href="#">Another action</a></li>
                <li><a class="dropdown-item" href="#">Something else here</a></li>
            </ul>
        </div>
        <!-- END COPY / PASTE -->

Additional Comment:

The `position-sticky` class is used on the header to make it sticky.
The `z-1` utility class sets a lower z-index for the header.
The `z-3` utility class sets a higher z-index for the dropdown to ensure it appears above the header.
Adjust the `z-index` values as needed using available Bootstrap utility classes (`z-0` to `z-3`).

✅ Answered with Bootstrap 5 best practices.

Didn’t find the answer you were looking for?

How do I adjust z-index using Bootstrap utilities to ensure my dropdown appears above a sticky header?

Asked on Dec 05, 2025

Answer

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