Image(
  ...
  frameBuilder: (BuildContext context, Widget child, int frame, bool wasSynchronouslyLoaded) {
    return Padding(
      padding: EdgeInsets.all(8.0),
      child: child,
    );
  },
  loadingBuilder: (BuildContext context, Widget child, ImageChunkEvent loadingProgress) {
    return Center(child: child);
  },
)