Space key doesn't scroll in reader mode

[breyed]

Normally, in Chrome, the Space key causes a webpage to scroll down. However, if you open a website in Reader mode with Fika and then press Space, nothing happens.

To Reproduce

1. Open reader mode on a page.
2. Press Space.

Expected behavior
Scroll down by one screen (just like if you weren't in reader mode).

Desktop:

• OS: macOS
• Browser: Chrome 96.0.4664.55