anchor.diff:      TextStyle descriptionStyle = theme.textTheme.subhead;
       TextStyle buttonStyle = theme.textTheme.button.copyWith(color: theme.primaryColor);
   
  -    return new Card(
  -      child: new SizedBox(
  -        height: 328.0,
  +    return new SizedBox(
  +      height: height,
  +      child: new Card(
           child: new Column(
             children: <Widget>[
               // photo and title
  
positive.code:       appBar: new AppBar(
          title: new Text('Travel stream')
        ),
        body: new Block(
          padding: const EdgeInsets.only(top: 8.0, left: 8.0, right: 8.0),
          children: destinations.map((TravelDestination destination) {
            return new Container(
  
negative.code:     assert(destination != null && destination.isValid);
    }
  
    static final double height = 328.0;
    final TravelDestination destination;
  
  
    @override
    Widget build(BuildContext context) {
  