title: Visual problems with the form background image
body: <p>This is the design of the app:</p>
  
  <p><img src="https://i.stack.imgur.com/3VqPT.jpg" alt="enter image description here"></p>
  
  <p>And this is what happens when i use the scrollbar up or down:</p>
  
  <p><img src="https://i.stack.imgur.com/s5dmy.jpg" alt="enter image description here"></p>
  
  <p>the checkboxes are inside a panel, the panel is transparent (obvious) only the form uses the background image.  </p>
  
  <p>why happens that distortion and how I can resolve the problem?</p>
  
  <p>PS: If you need more information or all the form or something just tell me.</p>