title: How to make button width match parent?
body: <p>I want to know that how can I set a width to <strong>match parent</strong> layout width</p>
  <pre><code>new Container(
    width: 200.0,
    padding: const EdgeInsets.only(top: 16.0),
    child: new RaisedButton(
      child: new Text(
        &quot;Submit&quot;,
        style: new TextStyle(
          color: Colors.white,
        )
      ),
      colorBrightness: Brightness.dark,
      onPressed: () {
        _loginAttempt(context);
      },
      color: Colors.blue,
    ),
  ),
  </code></pre>
  <p>I know about little bit on <code>Expanded</code> widget but <code>Expanded</code> expands view to both direction, i dont know how to do it.</p>