function reportdashboard_attributes() {
        global $CFG;

        $attributes = parent::reportdashboard_attributes();

        if (!empty($CFG->block_reportdashboard_allowcssclasses)) {
            if (!empty($this->config->classes)) {
                $attributes['class'] .= ' ' . $this->config->classes;
            }
        }

        return $attributes;
    }