Q:

Add scss file to the Stackblitz

Can you tell me how to add scss file to the stackblitz. I tried that.But it is not working. Please see that and let me know.
I have tried to add home.html
This is the project: stackblitz

A:

Scss should work in stackblitz:
@Component({
  selector: 'page-home',
  templateUrl: 'home.html',
  styleUrls: [ './home.scss' ] <== add this
})
export class HomePage {

Styles like
 page-home {
 .buttoncls {

won't work for you with default encapsulation(ViewEncapsulation.Emulated) because page-home is not part of home component template and angular adds attribute like [_ngcontent-c0] to styles.
So we can change page-home to ion-list and see how it works:
Stackblitz Example (ViewEncapsulation.Emulated)
But we can disable encapsulation: 
encapsulation: ViewEncapsulation.None

Stackblitz Example (ViewEncapsulation.None) 
See also this thread
https://github.com/stackblitz/core/issues/1
As EricSimons commented 9 days ago:

Hey all! We just shipped SASS and LESS support, and we also support
  the angular-cli.json config too :)

