title: controlsfx.GridView align left, how to make it align center
body: <p>here is my code:</p>
  
  <pre><code>    def list = FXCollections.observableArrayList([])
      GridView&lt;Color&gt; g = new GridView&lt;&gt;(list);
      g.setCellFactory(new Callback&lt;GridView&lt;Color&gt;, GridCell&lt;Color&gt;&gt;() {
          public GridCell&lt;Color&gt; call(GridView&lt;Color&gt; gridView) {
              return new ColorGridCell();
          }
      });
      Random r = new Random(System.currentTimeMillis());
      for (int i = 0; i &lt; 50; i++) {
          list.add(new Color(r.nextDouble(), r.nextDouble(), r.nextDouble(), 1.0));
      }
  </code></pre>
  
  <p>see my screenshot, the left padding and right padding is diff, how to align Gridview to center</p>
  
  <p><a href="https://i.stack.imgur.com/ijH7R.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ijH7R.png" alt="enter image description here"></a></p>