code: public function renderBodyEnd()
      {
          $lines[] = $this->body;
          if ($this->header !== false || !empty($this->header)) {
              $lines[] = Ui::endTag('div');
          }
          return implode("\n", $lines);
      }
docs: Renders the body (if any) and the final closing tags of the message
  @return string the end of the message's body