# Theme extension

Strapi's [admin panel](/cms/admin-panel-customization) can be displayed either in light or dark mode (see [profile setup](/cms/getting-started/setting-up-admin-panel#setting-up-your-administrator-profile)), and both can be extended through custom theme settings.

To extend the theme, use either:

- the `config.theme.light` key for the Light mode
- the `config.theme.dark` key for the Dark mode

:::strapi Strapi Design System

The default 

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