to change the colors of the program you have to modify theme.ron
file
Ron format located at config path. The path differs depending on the operating system:
$HOME/Library/Preferences/gitui/theme.ron
(mac)$XDG_CONFIG_HOME/gitui/theme.ron
(linux using XDG)$HOME/.config/gitui/theme.ron
(linux)
Valid colors can be found in ColorDef struct. note that rgb colors might not be supported in every terminal.