removeBaseStyles_(interstitial) {
    if (!interstitial || interstitial.displayOnBackground) {
      this.baseVideo_.style.zIndex = '';
    }
    if (!interstitial || interstitial.currentVideo != null) {
      this.baseVideo_.style.transformOrigin = '';
      this.baseVideo_.style.transition = '';
      this.baseVideo_.style.transform = '';
    }
    if (this.adContainer_) {
      this.adContainer_.style.pointerEvents = '';
      if (!interstitial || interstitial.background) {
        this.adContainer_.style.background = '';
      }
    }
    if (this.adVideo_) {
      this.adVideo_.style.background = '';
    }
  }
@param {?shaka.extern.AdInterstitial=} interstitial
@private