anchor.diff:  
     /// Creates a [MarkdownStyle] from the [TextStyle]s in the provided [theme].
     MarkdownStyle.defaultFromTheme(ThemeData theme) : super(
  -    a: new TextStyle(color: Colors.blue[500]),
  +    a: new TextStyle(color: Colors.blue),
       p: theme.textTheme.body1,
       code: new TextStyle(
  -      color: Colors.grey[700],
  +      color: Colors.grey.shade700,
         fontFamily: "monospace",
         fontSize: theme.textTheme.body1.fontSize * 0.85
       ),
  
positive.code:     listIndent: 32.0,
      blockquotePadding: 8.0,
      blockquoteDecoration: new BoxDecoration(
        backgroundColor: Colors.blue[100],
        borderRadius: new BorderRadius.circular(2.0)
      ),
      codeblockPadding: 8.0,
      codeblockDecoration: new BoxDecoration(
        backgroundColor: Colors.grey[100],
        borderRadius: new BorderRadius.circular(2.0)
      )
    );
  
negative.code:     listIndent: 32.0,
      blockquotePadding: 8.0,
      blockquoteDecoration: new BoxDecoration(
        backgroundColor: Colors.blue.shade100,
        borderRadius: new BorderRadius.circular(2.0)
      ),
      codeblockPadding: 8.0,
      codeblockDecoration: new BoxDecoration(
        backgroundColor: Colors.grey.shade100,
        borderRadius: new BorderRadius.circular(2.0)
      )
    );
  