Colorsets

Fvwm Colorsets is a fundamental way to define and manage colors within the FVWM window manager, enabling consistent and customizable styling of various GUI elements. They allow users to group colors (foreground, background, highlight, and shadow) and apply them to windows, titlebars, buttons, and other components, creating a consistent visual appearance.

Read more: https://www.fvwm.org/Wiki/Config/Colorsets/