# Hero String Envelope

> A full-bleed animated hero background made of straight SVG chords across a circle whose density forms a glowing epicycloid curve, with the cusp count morphing as the cursor moves horizontally.

- Author: [nikolas-sapa](https://21st.dev/@nikolas-sapa)
- Library: @ns-ui
- License: no-license
- Tags: Cursor, Hero, SVG, Generative
- Live preview: https://21st.dev/@nikolas-sapa/components/hero-string-envelope

## Install

```bash
npx shadcn@latest add "https://21st.dev/r/nikolas-sapa/hero-string-envelope?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/cursor.md