# Use themes on a view

By default, the `light` theme is applied to an app when a user enrolls for the first time. Any subsequent changes to the active theme are stored on the device and should persist through closing and reopening the app.

### `journey.config` methods

Themes can be set and retrieved programmatically using the `journey.config` namespace in JavaScript/TypeScript. See the [`journey.config`](https://docs.journeyapps.com/reference/build/js-ts-apis/journey/journey.config) documentation for more details.

### View level config

Similar to app-level config, we add support for overriding configuration for a view.

E.g. `main.view.config`

```json
{
  "themes": [
    {
      "name": "admin",
      "colors": {
        "system": {
          "primary": "lightblue"
        }
      }
    }
  ]
}
```

**Note:** View level config does not support defining (or extending) new themes. Overrides can only be applied to themes defined in the app-level `config.json`.

In the above example, we override the `primary` color of the `admin` theme (from `crimson` to `lightblue`) and it is important to note that this **only** applies to the `main` view in this instance.

All `colors` and `components` configuration can be overridden per view for each defined theme.