HarmonyOS 气泡提示 (Popup)怎么去除背景色

主要配置 shadow:{radius:0}

@Entry
@Component
struct Index {
  @State customPopup: boolean = false
  // popup构造器定义弹框内容
  @Builder
  popupBuilder() {
    Row({ space: 2 }) {
      Text('This is Custom Popup').fontSize(15)
    }.width(200).height(50).padding(5)
  }

  build() {
    Column() {
      Button('CustomPopupOptions')
        .position({ x: 100, y: 200 })
        .onClick(() => {
          this.customPopup = !this.customPopup
        })
        .bindPopup(this.customPopup, {
          builder: this.popupBuilder, // 气泡的内容
          placement: Placement.Bottom, // 气泡的弹出位置
          popupColor: Color.Transparent, // 气泡的背景色
          backgroundBlurStyle: BlurStyle.NONE,
          shadow: { radius: 0 },
          // shadow:ShadowStyle.OUTER_DEFAULT_XS,
          onStateChange: (e) => {
            console.info(JSON.stringify(e.isVisible))
            if (!e.isVisible) {
              this.customPopup = false
            }
          }
        })
    }
    .backgroundColor(Color.Pink)
    .height('100%')
    .width("100%")
  }
}