Print-friendly demos

[garncarz]

Expected behavior

Please make demos HTML pages offer a nicely printable documents, something like Wikipedia does.

Actual behavior

As of now it wants to print this:

Additional information

No response

Source code

Tracebacks

System information

Chrome 137.0.7151.70
Firefox 139.0.4
Windows 11

Existing GitHub issues

• [x] I have searched existing GitHub issues to make sure the issue does not already exist.