Backdrop opacity customization

[ionitron-bot]

Short description of the problem:

The current backdrop implementation, on ionic 2, doesn't let us customize the backdrop opacity. It's hardcoded.

What behavior are you expecting?

It should allow the option to change the opacity from and to values

Which Ionic Version? 1.x or 2.x
Ionic 2 - 2.0.0-rc.2

[SergioSuarezGil]

I’ve do it using the cssClass property in alertController (Ionic 4)

  async alertError(message: string) {
    const alert = await this.alertController.create({
      cssClass: 'alertClass',
      animated: true,
      header: 'Error',
      message,
      buttons: ['OK']
    });
    await alert.present();
  }

 ion-alert {
   &.alertClass{
     background: rgb(0,0,0,.8);
   }
 }