Documentation rendering issue starting with Ubuntu 23.10

The code we use to mask the border when rendering the doc (which is only used for the doc) stopped working. Might be a regression upstream, but still, we will need a workaround. Compiled in Docker using `ubuntu:23.04` and it worked. Both 23.10 and 24.04 don't work.

![Screen Shot 2024-08-18 at 13 12 26](https://github.com/user-attachments/assets/cd5c6d07-71e2-41d4-8cd8-3aec90c8ff3e)
