enqueue admin stylesheet on wordpress backend

gistfile1.php

<?php
function ebs_seo_cp_admin_init() {
  wp_register_style('ebs_seo_cp_admin_stylesheet', plugins_url('admin-stylesheet.css', __FILE__));
}
add_action( 'admin_init', 'ebs_seo_cp_admin_init' );

function ebs_seo_cp_admin_enqueue($hook) {
	$pages_array = array(
		'ebs_seo_cp_menu',
		'ebs_seo_cp_menu_view_options',
		'ebs_seo_cp_menu_contact_options',
		'ebs_seo_cp_menu_business_options',
		'ebs_seo_cp_menu_google_maps_options',
		'ebs_seo_cp_menu_social_media_options' 
	);
	if (is_admin() && in_array($_GET['page'], $pages_array)) {
		wp_enqueue_style('ebs_seo_cp_admin_stylesheet');
	}
}
add_action('admin_enqueue_scripts', 'ebs_seo_cp_admin_enqueue');
?>