<!-- spinner.php -->
<div id="spinner" class="show bg-white position-fixed translate-middle w-100 vh-100 top-50 start-50 d-flex align-items-center justify-content-center">
    <div class="spinner-border text-primary" style="width: 3rem; height: 3rem;" role="status">
        <span class="sr-only">Loading...</span>
    </div>
</div>
