title: IONIC4 : how to use cssClass for Loading , it is doesn't work
body: <p>I want to change ion-loading style using cssClass ,my code as follow:</p>
  
  <p>loading.page.ts :</p>
  
  <pre><code>@Component({
      selector: 'app-loading',
      templateUrl: './loading.page.html',
      styleUrls: ['./loading.page.scss'],
  })
  export class LoadingPage {
  
  constructor(public lLoadingController: LoadingController) { }
  
  async  presentCunstomLoading() {
      const loading = await this.lLoadingController.create({
          spinner: 'hide',
          duration: 500000,
          content: 'Please wait...',
          translucent: true,
          cssClass: 'custom-class'
      });
      return await loading.present();
  }
  }
  </code></pre>
  
  <p>loading.page.scss ::</p>
  
  <p>`</p>
  
  <pre><code>app-loading {
    .custom-class {
      background: #e0b500;
    }
  </code></pre>
  
  <p>}`</p>
  
  <p>loading.page.html :</p>
  
  <pre><code>&lt;ion-content padding&gt;
      &lt;ion-button (click)="presentModal()"&gt;open modal&lt;/ion-button&gt;
  &lt;/ion-content&gt;
  </code></pre>
  
  <p>What's problem with this? Anyone can help me . I am confused. Thanks advance.</p>