Form Login Tanpa Bootstrap

<!DOCtype>
<html>
<head>
    <title>Halaman login</title>
</head>
<body>
    <div class="col-md-4 col-md-offset-4 form-login">
        <div class="outter-form-login">
        <div class="logo-login">
            <em class="glyphicon glyphicon-user"></em>
        </div>
            <form action="" class="inner-login" Method="post">
            <h3 class="text-center title-login">Login ke dalam Aplikasi</h3>
                <div class="form-group">
                    <input type="text" class="form-control" name="username" placeholder="Masukkan Username Anda">
                </div>

                <div class="form-group">
                    <input type="password" class="form-control" name="password" placeholder="Masukkan Password Anda">
                </div>

                <button type="button" class="btn btn-success">Login</button>
            </form>
        </div>
    </div>
  </body>
</html>