<div class="container">
  <div class="row justify-content-center align-items-center" style="min-height: 100vh;">
    <div class="col-md-8 text-center">
      <div class="panel panel-default shadow-lg rounded-lg">
        <div class="panel-body p-5">
          <div class="row justify-content-center align-items-center">
            <div class="col-md-3 mb-4 mb-md-0">
              <i class="fa fa-exclamation-triangle" style="font-size: 125px; color: #e74c3c;"></i>
            </div>
            <div class="col-md-9">
              <h3 class="font-weight-bold" style="font-size: 1.8rem; color: #2c3e50;">You are not authorized to access this page.</h3>
              <p class="text-muted mt-3">Please contact the administrator if you believe this is a mistake.</p>
            </div>
          </div>
        </div>
      </div>
    </div>
  </div>
</div>

<!-- Add these to link FontAwesome icons and Bootstrap (if you are not using them already) -->
<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0-beta3/css/all.min.css" rel="stylesheet">
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.0/dist/css/bootstrap.min.css" rel="stylesheet">
