position: absolute doesn't work with new Shopify Order Printer

[Talfo]

With the newly released Shopify Order Printer, I would like to add a footer message to the bottom of the printed invoice.

So I added the following code at the beginning of the template:

<style>
  @media print {
    .footer-bottom {
      position: absolute;
      bottom: 0;
    }
  }
</style>

and at the bottom of the template:

<div class="footer-bottom">
  <hr>
  Footer message on the bottom of the page.
</div>

The code works with the previous version of Order Printer, but doesn't work with the new one.

The footer message is printed overlapping the body text.

"position: fixed; " instead of "absolute" may work, but the footer is also added to the packing slip that is subsequently printed, that's not intended...

Is there any idea to avoid the problem?