WordPress: hide parts of WP admin with CSS

hide_parts_of_wp_admin_with_css.php

<?php  
/**
 * Hide parts of WP admin with CSS. Awesome! Use in functions.php
 * CSS code gebruiken om delen van de admin voor klanten te verbergen
 * @author @david
 */
function david_admin_head() {
echo '<link href="'.get_bloginfo( 'template_url' ).'/wp-admin.css" rel="stylesheet" type="text/css">';
}
add_action('admin_head', 'david_admin_head');
?>

wp-admin.css

/*
@david :
Deze stylesheet wordt aangeroepen in functions.php
en is bedoeld om via CSS items in de WordPress Admin
te verbergen of aan te passen.

This stylesheet is used to hide parts of WP Admin with CSS,
and is enqueued in functions.php.
*/

/*See some examples below :-)*/

/* @plugin really Simple Share plugin */
#poststuff_right {
display: none
}

/*#dashboard_right_now,
#dashboard_recent_comments,
#dashboard_quick_press,
#dashboard_primary,
#dashboard_secondary,
#menu-links,
#menu-pages,
#wp-admin-bar-new-content,
#wp-admin-bar-comments, */

#menu-appearance a.wp-has-current-submenu:after,
#menu-appearance li:nth-child(1),
#menu-appearance li:nth-child(2),
#menu-appearance li:nth-child(3),
#menu-appearance li:nth-child(6)
{display:none;}