Print style sheet of home page omits title and other essential info

[bert-github]

The print version of the home page, omits the navigation menus, which is OK, but also the whole right-hand column (with, e.g., the "About W3C" section) and even the title, "W3C".

See a PDF of the home page (This PDF was made with WeasyPrint, but other programs show similar results.)