<filename>index.php<html>
    <head>
     <!DOCTYPE html>
     <html lang="en">
     <head>
        <meta charset="UTF-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Document</title>
</head>
<body>
    <center>
        <form id="login"  action="aulafor.php">
            <input type="submit" name="entrar" value="entrar">
</form>
    </center>
</body>
</html>