Load Custom Styles for Mantra Theme

<?php
// Load Custom Styles for Mantra Theme
if ( is_user_logged_in() && current_user_can('administrator') ) {
    add_action('wp_enqueue_scripts', 'my_mantra_custom_styles');
}
function my_mantra_custom_styles() {
    wp_register_style('mantra-custom-styles', get_bloginfo('template_directory').'/custom-styles.css', false, '1.0', 'all');
    wp_enqueue_style('mantra-custom-styles');
}
?>