Example 1 - Modification of the template

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

@Component({selector: 'digit',
styles : [`
                     .parent {
                             	background : #aaa;
                            	 color : #000;
                             	padding: 10px;
                 	}
     	`],
template: `
                     <div class="parent">
                                 <h1>Parent Component</h1>
                     </div>
     	`,
})

export class AppComponent {}