Custom Styles for Admin Section

// Custom Styles for Admin Section
function my_admin_styles() {
    wp_register_style('my-admin-styles', get_bloginfo('template_directory').'/admin_styles.css', false, '1.0', 'all');
    wp_enqueue_style('my-admin-styles');
}
add_action('admin_enqueue_scripts', 'my_admin_styles');