# Base Collapsible

> An animated collapsible panel that smoothly expands and collapses its content with height and fade transitions when its trigger button is toggled.

- Author: [Elliot Sutton](https://21st.dev/@skyleen77)
- Library: [Animate UI](https://21st.dev/@skyleen77/library/animate-ui)
- License: MIT
- Tags: Collapsible, Disclosure, Expand, Accordion, Animation
- npm dependencies: motion, @base-ui-components/react
- Live preview: https://21st.dev/@skyleen77/components/base-collapsible

## Install

```bash
npx shadcn@latest add "https://21st.dev/r/skyleen77/base-collapsible?api_key=$API_KEY_21ST"
```

Requires a 21st API key (generate one at https://21st.dev/mcp) passed as `API_KEY_21ST`. Free accounts get a limited number of installs per day; unlimited on a paid plan — see https://21st.dev/pricing.

Full component directory: https://21st.dev/llms.txt · More like this: https://21st.dev/community/components/s/collapsible.md