class="error" type="text" name="visitor_name" value="" required>
class="error" type="email" name="visitor_email" value="" required>
class="error" type="text" name="visitor_institution" value="" required>
class="error" <?php endif; ?>name="message" required><?php if ( $contact_form_response['status'] === 'error' ) : echo $contact_form_response['values']['message']; endif; ?>