Install gnome-color-chooser by entering the following commands in the terminal:
sudo apt update sudo apt install gnome-color-chooser
Description:
GTK+/GNOME desktop appearance customization tool
This is an application for customizing the appearance of the GNOME desktop. . Features: * change most important colors (e.g. background, window decoration, tooltips) * change colors and sizes of GTK+ widgets * colorize desktop icons * configure installed GTK+ engines and let your current theme be drawn by an installed GTK+ engine of your choice
Homepage: http://gnomecc.sourceforge.net
Version: 0.2.5-1.1
Section: universe/gnome