问Angular 6- ng-bootstrap风格的标签

EN

<ngb-tabset>
    <ngb-tab title="Tab 1">
        <ng-template ngbTabContent>
            Tab 1
        </ng-template>
    </ngb-tab>
    <ngb-tab title="Tab 2">
        <ng-template ngbTabContent>
            Tab 2
        </ng-template>
    </ngb-tab>
</ngb-tabset>

styles: [
`
 :host { color: red; }

 :host ::ng-deep parent {
   color:blue;
 }
 :host ::ng-deep child{
   color:orange;
 }
 :host ::ng-deep child.class1 {
   color:yellow;
 }
 :host ::ng-deep child.class2{
   color:pink;
 }
`
],