Untitled

<?php
include_once 'dbConfig.php';
?>
<html>
<head>
    <meta charset="UTF-8">
    <title>Just another website</title>

    <?php
    echo '<link href="site.css" rel="stylesheet" type="text/css">'  ;

    if(isset($_POST['btn-save']))
        {

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

            $sql_query = "INSERT INTO users(username,password,country) VALUES('$username','$password','$country')";
            mysql_query($sql_query);
        }
    ?>