# Themes Choose system, light, dark, or one of five presets, or define your own theme as design-token overrides. Themes restyle the whole app, terminals and their ANSI palette included.  ## Pick a theme Under **App Settings → Appearance**, choose **System** (follows the OS appearance live), **Light**, **Dark**, or a theme. Hovering an option previews it without saving. Five presets ship with the app: | Preset | id | Base | | --- | --- | --- | | Dracula | `dracula` | dark | | Tokyo Night | `tokyo-night` | dark | | Matrix | `matrix` | dark | | Hot Pink | `hot-pink` | dark | | Sepia | `sepia` | light | The theme is global, not per-project, and changes apply live. ## Write a custom theme A theme is a set of design-token overrides on a `dark` or `light` base. Add one under **App Settings → Appearance → Custom themes**, or from the shell: ``` ouijit theme save '{"id":"my-theme","name":"My Theme","base":"dark","tokens":{"--color-accent":"#ff2d55"}}' ouijit theme use my-theme ``` Any token is overridable: surface and text colors, accent, the full 16-color ANSI palette, diff colors, and shadows. The presets returned by `ouijit theme list` show the full token vocabulary; saving a theme with a preset's id overrides that preset, and deleting your copy restores it.