# Dark mode > For the complete documentation index, see [llms.txt](/llms.txt) > Enable dark mode for the Biel.ai chatbot widget. The Biel.ai widget automatically switches to dark mode when it detects `data-theme="dark"` on the `` tag. Add the attribute to your site's `` tag: ```html ``` Most documentation frameworks (Docusaurus, MkDocs Material, VitePress) set this attribute automatically when the user toggles dark mode — no additional configuration needed.