message: Add style for modal popup
diff: @@ -108,7 +108,9 @@ export class PopupViewModel extends Base {
  }
  public get styleClass(): string {
  var css = this.model.cssClass;
  - if (this.showPointer) {
  + if (this.isModal) {
  + css += " sv-popup--modal";
  + } else if (this.showPointer) {
  css += " sv-popup--show-pointer";
  css += ` sv-popup--${this.popupDirection}`;
  }
  