title: javafx separator not visible in hbox
body: <p>I can't get my separator to show up on my form. It is currently in an <code>HBox</code> that is in a <code>VBox</code>:</p>
  
  <pre><code>Separator separator1 = new Separator();
  hbox5.getChildren().add(separator1);
  </code></pre>
  
  <p>The separator is supposed to be under the <code>clear</code> and <code>calculate</code> <code>button</code> and above the <code>converted temperature</code> line.</p>
  
  <p><a href="https://i.stack.imgur.com/1GcCG.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/1GcCG.jpg" alt="enter image description here"></a></p>