PDF generation via jsPDF printing full width of the page

Question

jsPDF is generating a right hand margin. How do you control this?

The HTML text does not have the margin

Settings in jsPDF don't seem to matter. The angular method is

public pdfLetter(): void {
  this.downloaderLoader.loading();

  let pdfContent = document.querySelector('main[role=main]');
  const fileNameElement = document.querySelector('.block-field-blocknodecerttitle span')
  const dateString = new Date().toISOString().slice(0, 10).replace(/-/g, '');
  let fileName = dateString + 'cbi-letter.pdf'
  if (fileNameElement) {
    fileName = dateString + fileNameElement.innerHTML.replace(/[^A-Za-z0-9]/gi, '-');
  }

  if (!pdfContent) {
    this.downloaderLoader.unLoading()
    return;
  }

  let pdf = new jsPDF('p', 'pt', 'a4');
  // No difference
  pdf.setFontSize(10);
  // No difference
  pdf.setDisplayMode("fullwidth", "continuous","FullScreen");
  // Width no difference  
  pdf.html(pdfContent.innerHTML, {
    autoPaging: true,
    width: 210,
    margin: 15,
    x: 0,
    y: 0,
    callback: (pdf) => {
      pdf.save(fileName);
    }
  });

  this.downloaderLoader.unLoading()
}

CSS/SASS is setting the width to full width

.cert-certificate-letter
  font-size: 12px
  line-height: 1rem

main
  margin-left: 10mm
  margin-right: 10mm