Edit in JSFiddle

<div id="transparentdiv">
We have applied our css on this div
</div>
#transparentdiv {
     /* IE 8 */
   -ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=40)";
	filter: alpha(opacity=40); /* internet explorer */
	-khtml-opacity: .4;      /* khtml, old safari */
	-moz-opacity: .4;       /* mozilla, netscape */
	 opacity: .4;           /* fx, safari, opera */
    }