Odoo-Build/snippets/purchase.report_purchaseorder_document.format_title.xml

<data inherit_id="purchase.report_purchaseorder_document" priority="50">&gt;

  <xpath expr="//div/h2[1]" position="attributes"><attribute name="style">color: black; margin-top: 2rem</attribute></xpath>
  
  <xpath expr="//div/h2[2]" position="attributes"><attribute name="style">color: black; margin-top: 2rem</attribute></xpath>
  
  <xpath expr="//div/h2[3]" position="attributes"><attribute name="style">color: black; margin-top: 2rem</attribute></xpath>

</data>