How do I set up responsive font sizes (RFS) and when should I disable it?

Asked on Jul 20, 2025

1 Answer

Responsive Font Sizes (RFS) in Bootstrap automatically adjusts font sizes based on the viewport size, enhancing readability across devices. You might want to disable it for specific elements where a fixed font size is necessary.

<!-- BEGIN COPY / PASTE -->
        <style>
            .no-rfs {
                font-size: 1.5rem !important;
            }
        </style>

        <p class="no-rfs">This text will not use RFS and will remain at 1.5rem.</p>
        <!-- END COPY / PASTE -->

Additional Comment:

Use the `.no-rfs` class to apply a fixed font size, overriding RFS.
RFS is beneficial for maintaining proportional text sizes across devices.
Disable RFS when precise control over font size is needed for design consistency.

✅ Answered with Bootstrap 5 best practices.

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