Plugin option page does not display CSS (2.9.2)

Greetings!

I have created my first plugin with WordPress 2.9.2: it simply triggers an email notification to a distribution list whenever a blog post is made.

It works well but the CSS for the page showing the changes in option do not show up…only the notification message.

Here’s my plugin code

<?php
include('include/email-admin.php');
$email_list=get_option('email_list');

function email_team($post_ID)  {
    global $email_list;
    $team = $email_list;
    $body = 'There is a new post on the blog: https://my_host_name/wordpress';
    mail($team, "Blog Update",
      'There is a new post on the blog: https://my_host_name/wordpress');
    return $post_ID;
}
add_action ( 'publish_post', 'email_team' );
?>

…And my “include/email-admin” code

<?php
if (isset ($_POST['email_list'])) {
    $email_list = $_POST['email_list'];
    update_option('email_list', $email_list);    ?>
<div id="message" class="updated fade"><p><strong><?php _e('Options saved.') ?></strong></p></div>
    <?php} else {    $email_list = get_option('email_list');}?>

<?php
function email_team_create_menu() {
    add_menu_page('Email Team -  Plugin Settings',
            'Email Team - Settings', 'administrator',
            __FILE__, 'email_team_settings_page',
            '');
add_action( 'admin_init', 'register_mysettings' );
}
function register_mysettings() {
        register_setting( 'email_team-settings-group', 'email_list' );
}

function email_team_settings_page() {    ?>
<div class="wrap">
    <h2>Email Team - Settings</h2>
    <form method="post" action="<?php echo $_SERVER['PHP_SELF'];?>">
            <?php settings_fields( 'email_team-settings-group' ); ?>
        <table class="form-table">
            <tr valign="top">
                <th scope="row">Email list (separated by commas)</th>
                <td><input type="text" name="email_list" value="<?php echo get_option('email_list'); ?>" /></td>
            </tr>
        </table>
        <p class="submit">
        <input type="submit" class="button-primary" value="<?php _e('Save Changes') ?>" />
        </p>
    </form>
</div>
    <?php }
?>

The message Options saved does show up whenever I update the email distribution list but on a white background. All the CSS is missing….am I missing something?

Any help welcome. Thanks.

Al.