friendica/doc/themes.md

Themes

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The default Theme in Friendica is called frio.

Open Settings > Display > Custom Theme Settings adjust the Theme to your liking. Select your preferred Appearance - light, dark or black - and your favorite Accent color. Click Submit to save your changes.

The Custom Appearance allows to tweak the themes CSS and set colors for UI elements. So called schemestrings can be shared between users.

In the General Theme Settings you can also find the vier Theme, which precedes frio and is no longer officially maintained.