public function activity($html, $icon = null, $icon2 = null)
    {
        $this->activity = trim($html);

        if (! str_empty($icon)) {
            $this->activityIcon = trim($icon);
        }

        if (! str_empty($icon2)) {
            $this->activityIcon2 = trim($icon2);
        }

        return $this;
    }