title: jquery ui sortable placeholder cannot change background colour
body: <p>I can successfully change the border colour of the placeholder, but when I try change the background colour, nothing happens.</p>
  
  <p>This jsfiddle code best explains it: <a href="http://jsfiddle.net/EUVrK/1/" rel="noreferrer">http://jsfiddle.net/EUVrK/1/</a></p>