title: Set Background color for a selected item in a Select option (multiple)
body: <p>I'm trying to change the background color of the selected items in a listbox (select multiple options). </p>
  
  <p>I tried with css... I tried with  JavaScript... and with jquery... I really don't know what happen!! But I'm unable to find the answer :_(. </p>
  
  <p>I read at least 10 questions in this forum.. and I tried all the proposed solutions but I only can change the background of the complete list... not the selected items. The only way I found is to use an unordered list with clickable list items instead if my select - option ... but I'm working with a form, and I want to send to the server the selected items in the traditional way. </p>