title: jQuery UI draggable containment offset
body: <p>I have a 800x400px div and inside of it I have a div with 20x20px size.</p>
  
  <p>I'm using jQuery UI draggable with the containment option but I need to offset 20px off the sides of the parent div. </p>
  
  <p>So the draggable area should really be 760x360px, centered in the 800x400px.</p>
  
  <p>I know I could use another div, make it that size and put the smaller one on there but I need a solution that doesn't involve creating another div.</p>
  
  <p>Is this possible? Thanks in advance!</p>
  
  <p><strong>Edit</strong>: I can't use padding on the parent element because the div I'm dragging is absolute positioned.</p>