Another useful way to work with Font-Awesome in Angular is to use a directive, such as angular2-fontawesome, to make it easier to work with your icons in your templates. For example, you can provide a size property to the directive that will scale the icon to different sizes for you:

<ngb-panel>
  <ng-template ngbPanelTitle>
    <strong>
      <fa [name]="'user'" [size]=1></fa>
      Matt DeLucas
    </strong>
  </ng-template>
  <ng-template ngbPanelContent>
    <ul class="list-unstyled">
      <li><fa [name]="'newspaper-o'"></fa> Post 1</li>
      <li><fa [name]="'newspaper-o'"></fa> Post 2</li>
      <li><fa [name]="'newspaper-o'"></fa> Post 3</li>
    </ul>
  </ng-template>
</ngb-panel>