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我已经生成一个PDF使用mpdf库Codeigniter.我想以适当的边距附上标题图片和页脚图像,我创建了一个代码,但页眉和页脚重叠,请提前帮助我解决此问题

//controller
$this->load->library('m_pdf');
    $param = '"","A4","","",0,0,100,0,6,3,"L"';
    $pdf = $this->m_pdf->load($param);
    // $pdf->useOddEven = true;

    $pdf->SetHTMLHeader('<img src="' . base_url() . 'custom/Hederinvoice.jpg"/>');

    $pdf->SetHTMLFooter('<img src="' . base_url() . 'custom/footarinvoice.jpg"/>');
    $wm = base_url() . 'custom/Watermark.jpg';
    $pdf->SetWatermarkImage($wm);
    $pdf->showWatermarkImage = true;
      $data['main_content'] = 'dwnld';
    $this->load->view('template', $data);
    $html = $this->load->view('template_pdf', $data, true);
    $this->load->view('template_pdf', $data, true);
    $pdf->WriteHTML($html);
    $pdf->page = 0;
    $pdf->state = 0;
    $pdf->Output($pdfFilePath, "D");