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[`Workspace`](Workspace) › [on('css-change')](Workspace/on('css-change').md)
## Workspace.on('css-change') method
Triggered when the CSS of the app has changed.
0.9.7
**Signature:**
```typescript
on(name: 'css-change', callback: () => any, ctx?: any): EventRef;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| <code>name</code> | <code>'css-change'</code> | |
| <code>callback</code> | <code>() => any</code> | |
| <code>ctx</code> | <code>any</code> | _(Optional)_ |
**Returns:**
[`EventRef`](EventRef)