如何实现组件的阴影效果

@Entry 
@Component 
struct ShadowOptionDemo { 
  build() { 
    Row() { 
      Column() { 
 
        Column() { 
          Text('shadowOption').fontSize(12) 
        } 
        .width(100) 
        .aspectRatio(1) 
        .margin(10) 
        .justifyContent(FlexAlign.Center) 
        .borderRadius(50) 
        .shadow(ShadowStyle.OUTER_FLOATING_SM) 
 
        Column() { 
          Text('shadowOption').fontSize(12) 
        } 
        .width(100) 
        .aspectRatio(1) 
        .margin(10) 
        .justifyContent(FlexAlign.Center) 
        .borderRadius(50) 
        .shadow(ShadowStyle.OUTER_DEFAULT_MD) 
      } 
      .width('100%') 
      .height('100%') 
      .justifyContent(FlexAlign.Center) 
    } 
    .height('100%') 
  } 
}