title: Changing <p:tree> height
body: <p>I am using  and I have a long list of nodes.</p>
  
  <p>I can change the width size but not the height
  How can I change the tree height ?</p>
  
  <pre><code>.ui-tree-container {
     border:1px solid;
     width: 20%;
     height: 20%;
  }
  </code></pre>
  
  <p>Thanks</p>