app.component.ts

import {Component, ViewEncapsulation} from '@angular/core';

@Component({
  selector: 'app-root',
  template: `
<h1>Mon premier Component</h1>
<app-child></app-child>
`,
  styles: [`
    h1 {
      color : red;
    }
  `],
  encapsulation: ViewEncapsulation.Native
})
export class AppComponent {
  title = 'app works!';
}