title: Flutter remove spaces between rows in column
body: <p>I have a column with 3 rows, How I can remove space between rows?</p>
  
  <p>This is my code:</p>
  
  <pre><code>Widget _buildTable() {
      return Column(
        children: [
        Row(
          children: _getBtns(),
        ),
        Row(
          children: _getBtns(),
        ),
        Row(
          children: _getBtns(),
        ),
      ]);
    }
  
    List&lt;Widget&gt; _getBtns() {
      final result = &lt;Widget&gt;[];
      for (int i = 0; i &lt; 7; i++) {
        result.add( 
          Expanded(
            child: RaisedButton(color: Colors.green, onPressed: () {}),
          ),
        ); 
      }
  
      return result;
    }
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/SEukb.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/SEukb.png" alt="enter image description here"></a></p>
  
  <p>This is what i would like to get:</p>
  
  <p><a href="https://i.stack.imgur.com/HdlS2.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HdlS2.png" alt="enter image description here"></a></p>