Trilium Themes

Gruvbox, Harbor, Coffee, Solarized and Tokyo Night themes for TriliumNext – each available in a dark and a light variant. The themes are plain text/css files that override Trilium's --* variables on #trilium-app and the global menus.

Theme	Dark	Light	Source
Gruvbox	gruvbox-dark.css	gruvbox-light.css	morhetz/gruvbox (MIT)
Harbor	harbor-dark.css	harbor-light.css	HANCORE-linux/omarchy-harbor-theme (MIT)
Coffee	coffee-dark.css	coffee-latte.css	megabyte0x/omarchy-coffee-theme (MIT)
Solarized	solarized-dark.css	solarized-light.css	Solarized by Ethan Schoonover (MIT)
Tokyo Night	tokyonight-dark.css	tokyonight-light.css	tokyonight.nvim (Apache-2.0)

All variants are fixed (dark stays dark, light stays light) – Trilium user themes do not auto-switch with the system preference. Each theme is derived from Trilium's default next theme (next-dark / next-light as the base).

Palette overview

Family	Dark	Light
Gruvbox	bg #282828 / fg #ebdbb2 · red #fb4934 green #b8bb26 yellow #fabd2f	bg #fbf1c7 / fg #3c3836 · blue #076678 aqua #83a598
Harbor	bg #1b1b1b / fg #efebdc · coral #e75a50 gold #E1CE98 slate #77838a	bg #dfe4c4 / fg #1c2d28 · nord-blue #5e81ac
Coffee	bg #1d150f / fg #f0e2d0 · caramel #e0a15c cream-yellow #ffda92	bg #E8E3C3 / fg #2D1A1D · berry #8e2d53
Solarized	bg #002b36 / fg #839496 · blue #268bd2 cyan #2aa198	bg #fdf6e3 / fg #657b83 · blue #268bd2
Tokyo Night	bg #24283b / fg #c0caf5 · blue #7aa2f7 magenta #bb9af7	bg #e1e2e7 / fg #3760bf · blue #2e7de9 red #f52a65

Install in Trilium

1. In Trilium create a code note (type code) with mime text/css under a folder of your choice, e.g. Resource & Templates.
2. Copy the contents of the theme file you want into the note.
3. Add two labels to the note:
   • appTheme → the display name, e.g. Coffee (shown in the theme dropdown)
   • appThemeBase → next-dark for dark variants, next-light for light variants
4. Reload the app, then go to Options → Appearance → Theme and pick your theme.

Example attributes for the dark Coffee theme:

appTheme = Coffee
appThemeBase = next-dark
iconClass = bx bxs-coffee

Customising

The themes are variable-driven. Edit the --* values inside the #trilium-app { ... } block and the global :root { ... } block (menus/dropdowns render outside #trilium-app). The .ck-content rules at the bottom style note headers, tables and tree-lines per palette.

License

Released under the MIT License – see LICENSE. Copyright © 2026 Richard Zink.

The color schemes are derived from the following repositories (all MIT licensed, see the header comment in each theme file):

• Gruvbox – morhetz/gruvbox
• Harbor / Harbordark – HANCORE-linux/omarchy-harbor-theme and omarchy-harbordark-theme
• Coffee / Coffee Latte – megabyte0x/omarchy-coffee-theme and omarchy-coffee-latte-theme
• Solarized – ethanschoonover.com/solarized (MIT)
• Tokyo Night / Day – folke/tokyonight.nvim (Apache-2.0)