title: How to take out white borders in JMenu and JMenuItems
body: <p>I'm doing this Graphic Interface with Swing. The problem that i'm having is that i can't take the white borders that are arround the JMenuItems, and paint it all of black. Here is an image:</p>
  
  <p><a href="https://i.stack.imgur.com/6TtGj.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/6TtGj.png" alt="enter image description here"></a></p>
  
  <p>I would like to paint it like this (I have edited the image with paint :D):</p>
  
  <p><a href="https://i.stack.imgur.com/5Jwp3.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5Jwp3.png" alt="enter image description here"></a></p>
  
  <p>Could someone help me? I'll appreciate any help. Thank you!</p>