if( ! function_exists( 'kleo_side_menu_button' ) ) {
    /**
     * Add side button to menu
     * @param string $items
     * @param object $args
     * @return string
     */
    function kleo_side_menu_button ( $items, $args )
    {
        if ($args->theme_location == 'primary')
        {
            $items .= '<li id="nav-menu-item-side" class="menu-item">' .
                '<a href="#" class="open-sidebar" onclick="javascript:return false;" rel="nofollow">' .
                '	&nbsp;	&nbsp;	&nbsp;MORE	&nbsp;	&nbsp;	&nbsp;    <i class="icon-menu"></i>' .
                '</a>' .
                '</li>';
        }
        return $items;
    }
}