I don't see anything on this page but a couple of headings and some pictures, with large swaths of whitespace, bullets without any item, etc. Neither in Firefox

I don't see anything on this page but a couple of headings and some pictures, with large swaths of whitespace, bullets without any item, etc. Neither in Firefox nor Chromium. I had to switch to reader mode in Firefox to get any text? The same behaviour occurs on all the website... What gives? Here's a capture for anyone interested: https://demo.intellique.org/nextcloud/index.php/s/xM6QCQXReFSHzee https://demo.intellique.org/nextcloud/index.php/s/xM6QCQXReF...