title: How to add a border to layout?
body: <p>I would like to add a border to a layout, but I can't. This is the layout:</p>
  
  <pre><code>HPOUT1L_layout = QHBoxLayout()
  HPOUT1L_layout.addLayout(HPOUT1L_connectors_layout)
  HPOUT1L_layout.addWidget(lbl_HPOUT1L)
  </code></pre>
  
  <p>I tried using styles, but it didn't work.
  Perhaps I could use QFrames instead, but I have to do a lot of changes. </p>