php passing data form

i use get method to pass data from index.php to profile.php

index.php code is

<html>
<body>

<form action="profile.php" method="GET">
username: <input type="text" username="user"><br>
password: <input type="password" name="pass"><br>
<input type="submit">
</form>

<button type="button" onclick="alert('task success')"/>click me"</button>

</body>
</html>

profile.php code is

<?php
    echo " username: "$_GET ['username']."; password "$_GET['pass'];
?>

the output is
enter image description here

it pass the inputs of the form successfully but i need it to appear in profile.php file

how can i make the output appear in profile.php page?

any help please