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Themes

Dash supports built-in themes and custom theme packages. Themes affect the admin shell, dashboard summary layout, density, and CSS tokens.

Theme Package​

A theme package is a zip file containing allowed root-level files:

manifest.json
tokens.css
recipes.css
preview.png

See Theme Package for package format and validation rules.

Upload​

Theme packages can be uploaded from the admin console or through the system theme API. Invalid packages are rejected and do not change the active theme.

Apply​

Applying a theme updates the active theme setting. The browser loads the active CSS from:

/theme/active.css

The active manifest is available at:

/theme/active.json

The default theme can return 404 for active.json.

Storage​

Theme metadata and active theme setting are stored in PostgreSQL. Theme files are stored under Dash theme storage in DASH_HOME.