This step might NOT be necessary, but probably is, if you are on a new install
cp /usr/share/zim/style.conf ~/.config/zim/
gedit ~/.config/zim/style.conf
Make this change for easier readability in dark mode
[Tag link]
foreground=aquamarine

Technical notes, and other ideas.
This step might NOT be necessary, but probably is, if you are on a new install
cp /usr/share/zim/style.conf ~/.config/zim/
gedit ~/.config/zim/style.conf
Make this change for easier readability in dark mode
[Tag link]
foreground=aquamarine