iLexN
11/8/2013 - 4:10 AM

CSS OVERLAY TECHNIQUES http://tympanus.net/codrops/2013/11/07/css-overlay-techniques/

<html>
  <body>
   <div class="overlay"></div>
   <!--...-->
  <body>
<html>

html, body{
  min-height: 100%;
}
body{
  position: relative;
}
.overlay{
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10;
  background-color: rgba(0,0,0,0.5); /*dim the background*/
}