These are the colors present in Zim which uses GTK
How can I change them to more of my liking? The color for links is very hard to read on the dark Breeze theme.
Kubuntu 18.10 (Kernel: 4.18.0-17-generic) & Zim (0.68) installed via terminal
I'm still on Kubuntu 18.04 but it appears that the version of Zim is the same in 18.10.
… change the colors used for links, underline etc. ?
Copy "/usr/share/zim/style.conf" to "~/.config/zim/" and edit as you see fit. See the Config Files page for the syntax of this file.
That allows users to modify several aspects of Zim's appearance, including links.
To get the image below, I edited my ~/.config/zim/style.conf to change the link color from blue to aquamarine.