title: How to make a div's background color translucent?
body: <p>I only want the background color of white in my div to be translucent roughly 50%.  The content should be fully opaque.  What's the proper way to do this?  I imagined when I looked up the <a href="http://www.w3schools.com/css/css_background.asp" rel="noreferrer">background CSS property</a>, I'd find an opacity setting, but didn't.  Don't care about IE6.</p>
  
  <p><strong><em>UPDATE</em></strong>: solving with the rgba solution given below in conjunction with <a href="http://css3pie.com/documentation/supported-css3-features/#rgba" rel="noreferrer">CSS3PIE's solution for getting rgba to work in IE browsers</a>.</p>