Themes
Mark ships with 32 built-in themes — 15 families with a light and a dark member, plus two dark-only themes — switchable from View > Theme in the menu bar. One title-bar button flips the current family between its light and dark side.
Families (light / dark)
- Paper / Ink
- Docs / Docs Dark
- macOS / macOS Dark
- Graphite / Graphite Dark
- Ulysses / Ulysses Dark
- One Light / One Dark
- Nord Light / Nord
- Gruvbox Light / Gruvbox Dark
- Everforest Light / Everforest Dark
- Solarized Light / Solarized Dark
- Rosé Pine Dawn / Rosé Pine
- Kanagawa Lotus / Kanagawa
- Catppuccin Latte / Catppuccin Mocha
- Ayu Light / Ayu Dark
- Tokyo Night Light / Tokyo Night
Dark only
- Alucard
- Dracula
Every theme is in the diagram gallery too — pick a theme there and watch every diagram type recolour.
Custom CSS
You can add custom CSS overrides in Preferences > Theme > Custom CSS. This CSS is injected after the theme stylesheet, so you can override any variable.
Theme CSS variables follow the pattern --editorBgColor, --editorColor, --sideBarBgColor, etc.