A bit related to my previous post about using jQuery UI elements in the WordPress admin interface, it’s likely that at some point you want to load your own CSS styles to your plugin or theme’s admin pages.
// link some styles to the admin page
$starterstyles = plugins_url ('starter-styles.css', __FILE__);
wp_enqueue_style ('starterstyles', $starterstyles );
There’s a usage example in the WordPress Codex: