message: fix(Confirmation): background will not scroll away from overlay
  ISSUES CLOSED:
diff: @@ -295,6 +295,7 @@ export class TsConfirmationDirective implements OnDestroy, OnInit {
  const overlayConfig: OverlayConfig = new OverlayConfig({
  positionStrategy,
  + scrollStrategy: this.overlay.scrollStrategies.reposition(),
  hasBackdrop: true,
  backdropClass: 'ts-confirmation-overlay',
  panelClass: ['qa-confirmation', 'ts-confirmation-overlay__panel', `${positionClass}`],
  