anchor.diff:  ///
   /// {@tool sample}
   ///
  -/// This example shows a 48x48 green square (placed inside a [Center] widget in
  +/// This example shows a 48x48 amber square (placed inside a [Center] widget in
   /// case the parent widget has its own opinions regarding the size that the
   /// [Container] should take), with a margin so that it stays away from
   /// neighboring widgets:
  
positive.code: /// The [constraints] are set to fit the font size plus ample headroom
  /// vertically, while expanding horizontally to fit the parent. The [padding] is
  /// used to make sure there is space between the contents and the text. The
  /// `color` makes the box teal. The [alignment] causes the [child] to be
  /// centered in the box. The [foregroundDecoration] overlays a nine-patch image
  /// onto the text. Finally, the [transform] applies a slight rotation to the
  /// entire contraption to complete the effect.
  ///
  /// ```dart
  
negative.code: /// Center(
  ///   child: Container(
  ///     margin: const EdgeInsets.all(10.0),
  ///     color: Colors.amber[600],
  ///     width: 48.0,
  ///     height: 48.0,
  ///   ),
  