Untitled

<?php
    function login($username, $password) {
        if($username == "Admin" && $password == "p4ssM3") {
            return true;
        }
        else {
            return false;
        }
    }
    if (isset($_POST['username']) && isset($_POST['password']) {
        $login = login($_POST['username'], $_POST['password']);
    }
    else {
        $login = false;
    }
?>
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>Login</title>
</head>

<body style="background:url('login.jpg');color:white;">
<?php
    if ($login == true) {
?>
    <h1 style="text-align:left;font-weight:bold;test-decoration:underline;">Panel</h1>
    <p>
        <h3>Username: <?= $_POST['username']; ?></h3>
    </p>
<?php
    }
    else {
?>
    <h1 style="text-align:left;font-weight:bold;test-decoration:underline;">Login</h1>
    <form method="post">
        <input type="text" name="username" />
        <input type="password" name="password" />
        <p>
            <input type="submit" value="Log In" />
        </p>
    </form>
<?php
    }
?>
</body>
</html>