/* ---------------------------------------------------------------------------------
 * Adding Stylesheet to wp-admin
 *
 */

function custom_login(){
    // Register Style
    wp_register_style('login-style', get_bloginfo('stylesheet_directory') . '/css/custom-login.css', array('colors'));

    // Add login style
    wp_print_styles('login-style');
}
add_action('login_head', 'custom_login');