Tutorial footers are black (1,1-dev)

Steps to reproduce:

• Open Inkscape
• Help > Tutorials > Inkscape: Basic
• Scroll to the bottom

What happened?

Footer is black

Previous	Current behaviour

What should have happened?

Previous behaviour (see left screenshot above)

Version Info:

Inkscape 1.1-dev (5c7c05abd9, 2020-10-19) Linux Mint 20

Testing before and after, introduced in commit inkscape@400b9736 Fix #1896 (moved) Tutorials should Open as new documents