Including CSS and JS on Admin Screen of Custom Theme Options

If you create an admin theme plugin from the Codex steps, you will notice it says not to insert stylesheets as per above – although the above will work.

If you place the following inside your admin theme file, it will serve the same purpose, but uses the wp_enqueue_styles approach:

function add_admin_theme_styles() {
    wp_register_style($handle="mytheme-theme-admin-styles", $src = plugins_url('wp-admin.css', __FILE__), $deps = array(), $ver="1.0.0", $media="all");
    wp_enqueue_style('mytheme-theme-admin-styles');}
    add_action('admin_print_styles', 'add_admin_theme_styles');