To center a Bootstrap button horizontally, you can use Bootstrap's utility classes for flexbox and margin. Here's a simple example using "d-flex" and "justify-content-center".

<!-- BEGIN COPY / PASTE -->
        <div class="d-flex justify-content-center">
            <button type="button" class="btn btn-primary">Centered Button</button>
        </div>
        <!-- END COPY / PASTE -->

1. Wrap your button in a "
   " with the classes "d-flex" and "justify-content-center" to center it horizontally.
2. The "d-flex" class applies a flexbox layout, and "justify-content-center" centers the content horizontally.
3. This method works well for centering elements within a parent container.