KCI-PHP-KANBAN/app/Views/auth/callback-error.php

<div class="text-center py-5">
  <h1 class="h3 text-danger mb-3">Authentication Error</h1>
  <p class="text-muted mb-4"><?= e($error ?? 'An authentication error occurred.') ?></p>
  <a href="/auth/login" class="btn btn-primary">Try Again</a>
</div>