Untitled

<!doctype html>
<html>
    <head>
    <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
        <meta name="description" content="$1">
        <meta name="viewport" content="width=device-width, initial-scale=1">

        <link rel="stylesheet" type="text/css" href="style.css">

        <title>test</title>

        <?php
        include_once 'dbConfig.php';
        ini_set('display_errors', 1);
        ini_set('display_startup_errors', 1);
        error_reporting(E_ALL);
        ?>

        <h1 class="h1">Login</h1>
    </head>

    <?php
        if(isset($POST['login'])){

            $stmt = $mysqli->prepare("SELECT id FROM users WHERE username=? AND password=?");
            $stmt-> bind_param("ss", $username, $password);

            $username = $_POST["username"];
            $password = $_POST["password"];

            $stmt->execute();
            if($stmt->execute == true){
                header("Location: http://localhost/test2/Home.php");
            }

        }
    ?>

       <body>

       <form method="post" id="registerForm">
        <label id="first"> Username</label><br/>
        <input type="text" required name="username"><br/>
        <br/>
        <label id="first">Password</label><br/>
        <input type="password" required name="password"><br/>
        <br/>
        <input type="submit" value="Sign in" name="login"/>

       </body>
</html>