Untitled

<?php

$msg = '';
include 'include/connection.inc.php';
if(isset($_POST['login'])) {

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

    header("Location:dashboard.php");
    if(!$password || !$username) {
        $msg = "Username or password incorrect!";
        echo '<p class = "error">'.$msg.'</p>';


        }


    }
?>


<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <link type="text/css" rel="stylesheet" href="css/style.css" >
    <title>PHP&amp;MySQL: Login | Zadaca 3</title>
</head>
<body>
    <div class="login-form">
        <div class="login-header">
            <h2 align="center">Login</h2>
        </div>
        <p class="error"<?php echo $msg; ?>></p>
        <form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="POST">
            <div class="form-group">
                <label class="loginlabel">Username</label><input type="text" name="username" />
            </div>
            <div class="form-group">
                <label class="loginlabel">Password</label><input type="password" name="password" />
            </div>
            <div class="form-group>">
                <input type="submit" name="login" class="login-button" value="Login">
            </div>
        </form>
    </div>
</body>
</html>