Answer / A. Vinoth Saravanan

In Angular 2, you can define CSS using the `styles` property for inline styles or the `styleUrls` property for external stylesheets. To use them, follow these steps:

1. Declare the component and add the styles or styleUrls:

```typescript
import { Component } from '@angular/core';

@Component({
selector: 'my-app',
template: `<h1>Hello World!</h1>`,
styles: [`h1 { color: red; }`],
styleUrls: ['styles.css']
})
export class AppComponent {}
```

2. Create the external CSS file (styles.css) and define your styles there.

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