title: JPanel Drop Shadow
body: <p>I have a <code>JPanel</code> element and I would like added a drop shadow to it, how can I add a nice faded drop shadow to the element? Do I need to use external libraries or is there something that is built in that I can use?</p>
  
  <p>Example:</p>
  
  <p><img src="https://i.stack.imgur.com/Gfn3f.png" alt="enter image description here"></p>