="modal-header">
    <button type="button" class="close" data-dismiss="modal">&times;</button>
    <h4 class="modal-title">Confirm Login</h4>
</div>
<form id="challenge_send_code" action="login.php" method="POST" data-redirect="login.php">
    <div class="modal-body">
        
        <div class="alert alert-warning verification-code-alert hidden" role="alert"></div>
        <div class="alert alert-danger code-alert hidden" role="alert"></div>

        <div class="form-group username-input">
    