presentation 'print to PDF' has lost styling

When @hiro developed the community slides for presentations, it was possible to save a presentation as a PDF and it kept its format very well.

But now, if I ask it to save as a PDF, I lose the background and other styles and images, and it looks like a thing to print in paper.

Steps to reproduce:

• go to https://community.torproject.org/es/training/resources/all-about-tor/?print-pdf
• print the page to pdf

Error:

The resulting pdf does not have a footer

What should happen:

the PDF looks the same as the slides at https://community.torproject.org/training/resources/all-about-tor/ and allow to use it as slides for a presentation.