anchor.diff:  import 'package:flutter/gestures.dart';
   import 'package:flutter/widgets.dart';
   
  -import 'colors.dart';
  -import 'typography.dart';
  +import 'theme.dart';
  +import 'theme_data.dart';
   
   const double _kScreenEdgeMargin = 10.0;
   const Duration _kFadeDuration = const Duration(milliseconds: 200);
  
positive.code: 
    @override
    Widget build(BuildContext context) {
      return new Positioned.fill(
        child: new IgnorePointer(
          child: new CustomSingleChildLayout(
  
negative.code:               opacity: 0.9,
                child: new Container(
                  decoration: new BoxDecoration(
                    backgroundColor: darkTheme.backgroundColor,
                    borderRadius: new BorderRadius.circular(2.0)
                  ),
                  height: height,
                  padding: padding,
                  child: new Center(
                    widthFactor: 1.0,
                    child: new Text(message, style: darkTheme.textTheme.body1)
                  )
                )
              )
  