ng-custom-properties#card.ts

@Component({
  selector: 'app-card',
  template: `
  <header></header>
  <main>
    <section class="top"></section>
    <button class="fab">+</button>
    <section class="bottom"></section>
  </main>
  `,
  styles: [`
    header {
      background-color: #5c6bc0;
     }

    .fab {
      background-color: #ec407a;
    }

    // ...
`]
})
export class CardComponent {}