Bug#1001693: userguide.html missing background

[積丹尼 Dan Jacobson]

Package: i3-wm
Version: 4.20.1-1
Severity: minor
File: /usr/share/doc/i3-wm/userguide.html

Browsing
https://i3wm.org/docs/userguide.html
/usr/share/doc/i3-wm/userguide.html
The former has a black background, missing in the latter.