title: Can inscribe text into buttons in Flutter
body: <p>I am trying to make keyboard like this</p>
  
  <p><a href="https://i.stack.imgur.com/MI2Ag.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/MI2Ag.png" alt="enter image description here"></a></p>
  
  <p>but instead I get this</p>
  
  <p><a href="https://i.stack.imgur.com/mzmh5.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/mzmh5.png" alt="enter image description here"></a></p>
  
  <p>Each my button is </p>
  
  <pre><code>class PinyinButton extends StatelessWidget {
  
    final VoidCallback onPressed;
  
    final List&lt;String&gt; titles;
  
    PinyinButton({this.onPressed, this.titles});
  
    @override
    Widget build(BuildContext context) {
      return new SizedBox(
        width: 30.0,
        height: 60.0,
        child: new RaisedButton(onPressed: this.onPressed, child: new Column(
            children: titles.map((title) =&gt; new Text(title)).toList()
        ))
      );
    }
  }
  </code></pre>
  
  <p>and apparently each button or other container has some padding, which makes text to wrap early. How to remove this padding</p>