# Star Border · Pro

Two points of light chase each other around a button or card's border in opposite directions, each with a short tail and a glow. CSS only, from one registered angle.

This is a Charcoal UI Pro component. Its source and examples are available with a Pro seat: https://charcoalui.com/pricing

## With a Pro seat

1. Add the registry to components.json:

```json
{
  "registries": {
    "@charcoal": {
      "url": "https://charcoalui.com/r/{name}.json",
      "headers": {
        "Authorization": "Bearer ${CHARCOAL_LICENSE_KEY}"
      }
    }
  }
}
```

2. Copy your licence key from https://charcoalui.com/dashboard and put it in .env.local as CHARCOAL_LICENSE_KEY, then:

```bash
npx shadcn@latest add @charcoal/star-border
```

To read Pro source through this MCP server, reconnect it with the header "Authorization: Bearer <licence key>".

## API — Star Border
| Prop | Type | Default | Notes |
| --- | --- | --- | --- |
| `as` | `"div" \| "button"` | `"div"` | A button gets focus styles and `type="button"`. |
| `color` | `string` | `"var(--ember)"` | Light colour. |
| `speed` | `number` | `6` | Seconds per lap. |
| `size` | `number` | `12` | Glow radius in px; also lengthens the tail. |
| `thickness` | `number` | `1.5` | Border thickness in px. |
| `children` | `ReactNode` | — |  |
| `className` | `string` | — |  |

See it live: https://charcoalui.com/docs/components/star-border