如何仅使用margin来解决外边距问题

@Entry 
@Component 
struct Index{ 
  build() { 
    Row() { 
      Column() { 
        Text(this.message) 
          .fontSize(50) 
          .fontWeight(FontWeight.Bold) 
          .textAlign(TextAlign.Center) 
          .width('80%') 
          .constraintSize({ maxWidth: '100%' }) 
          .backgroundColor(Color.Blue) 
          .margin({ left: 50, right: 50 }) 
      } 
      .width('100%') 
    } 
    .height('100%') 
  } 
}