public function continue_links(lesson $lesson, $lastpageseenid) {
        global $CFG;
        $output = $this->output->box(get_string('youhaveseen','lesson'), 'generalbox boxaligncenter');
        $output .= $this->output->box_start('center');

        $yeslink = html_writer::link(new moodle_url('/mod/lesson/view.php', array('id' => $this->page->cm->id,
            'pageid' => $lastpageseenid, 'startlastseen' => 'yes')), get_string('yes'), array('class' => 'btn btn-primary'));
        $output .= html_writer::tag('span', $yeslink, array('class'=>'lessonbutton standardbutton'));
        $output .= '&nbsp;';

        $nolink = html_writer::link(new moodle_url('/mod/lesson/view.php', array('id' => $this->page->cm->id,
            'pageid' => $lesson->firstpageid, 'startlastseen' => 'no')), get_string('no'), array('class' => 'btn btn-secondary'));
        $output .= html_writer::tag('span', $nolink, array('class'=>'lessonbutton standardbutton'));

        $output .= $this->output->box_end();
        return $output;
    }