<h1> .. registrierung</h1>
    <div class="centersh ..">
        <form method="post" name="register">
            <table width="30%">
                <tr>
                    <td><input type="text" name="username" placeholder="Ihre Name" required /></td>
                </tr>
                <tr>
                    <td><input type="password" name="password" placeholder="Ihr Passwort" required /></td>
                </tr>
                <tr>
                    <td><button type="submit" name="register">Anmelden</button></td>
                </tr>
            </table>
        </form>
    </div>