PubChem recipe page layout broken

[egonw]

The layout of the https://iupac.github.io/WFChemCookbook/datasources/pubchem.html page seems broken:

To Reproduce

Steps to reproduce the behaviour

1. Go to https://iupac.github.io/WFChemCookbook/datasources/pubchem.html
2. See a different narrow layout with navigation and footer at the top

Expected behaviour

I expected the navigation and footer at the bottom, not in separate columns.

Environment

• Browser: Brave 1.87.191 based on Chromium 145.0.7632.120