How to configure custom RGB colors for background, text, cursor, and selection?

[valorisa]

Question: How to configure custom RGB colors for background, text, cursor, and selection?

Context

• macOS Sequoia (Apple Silicon, M2)
• cmux.app installed via DMG from https://cmux.com
• Using native Terminal.app profile with custom RGB colors

Desired color scheme

I want cmux to use these exact RGB values (same as my Terminal.app profile):

Element	RGB	HEX
Background	0, 0, 255	#0000FF (pure blue)
Foreground (normal & bold text)	255, 255, 255	#FFFFFF (pure white)
Cursor	255, 255, 255	#FFFFFF (pure white)
Selection background	162, 255, 44	#A2FF2C (acid green)
Selection foreground	255, 255, 255	#FFFFFF

What I've tried

1. Created ~/.config/ghostty/config with:

   background = #0000FF
   foreground = #FFFFFF
   cursor-color = #FFFFFF
   selection-background = #A2FF2C
   selection-foreground = #FFFFFF
   bold-foreground = #FFFFFF

2. Also tried ~/.config/cmuxterm/config and ~/.config/cmux/config
3. Restarted cmux.app completely (pkill + relaunch)

Current behavior

• cmux.app window opens with default black background / white text
• Custom colors from Ghostty config do not seem to be applied

Questions

1. Does cmux.app read ~/.config/ghostty/config by default, or is there a cmux-specific config path?
2. Is there a way to force RGB/TrueColor values (not just named themes)?
3. Are there any known limitations for color customization in the current version?

Environment

• cmux version: [to fill: open cmux → Help → About, or check ~/Applications/cmux.app/Contents/Info.plist]
• macOS: Sequoia 15.x (Apple Silicon M2)

valorisa@Mac-mini-M2 ~ %  defaults read /Applications/cmux.app/Contents/Info.plist CFBundleShortVersionString
0.63.2

Thanks for your help! 🎨

[spellitwithaph]

I use the following directories for my config.ghostty file and the apps reflect their config as expected

• cmux
  • ~/Library/Application\ Support/com.cmuxterm.app/
• ghostty
  • ~/Library/Application\ Support/com.mitchellh.ghostty/