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Why aren't my responsive margin classes applying correctly on mobile devices in Bootstrap?

Asked on Nov 28, 2025

Answer

Responsive margin classes in Bootstrap 5 allow you to control the spacing of elements across different screen sizes. If they aren't applying correctly on mobile devices, ensure you are using the correct class names and that your HTML structure is correct.

<!-- BEGIN COPY / PASTE -->
        <div class="container">
            <div class="row">
                <div class="col-12 col-md-6 mb-3 mb-md-0">
                    <div class="p-3 bg-primary text-white">Responsive Margin Example</div>
                </div>
            </div>
        </div>
        <!-- END COPY / PASTE -->

Additional Comment:

Ensure you are using the correct responsive margin classes. For example, `mb-3` applies a bottom margin on all screen sizes, while `mb-md-0` removes it on medium and larger screens.
Verify that your Bootstrap CSS file is correctly linked in your project and is the latest version.
Check for any custom styles that might be overriding Bootstrap's default styles.
Use browser developer tools to inspect the element and see if the margin classes are being applied as expected.

✅ Answered with Bootstrap 5 best practices.

Ask any question about Bootstrap here... and get an instant response.

Why aren't my responsive margin classes applying correctly on mobile devices in Bootstrap?

Asked on Nov 28, 2025

Answer

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