html, body{
  min-height: 100%;
}
body{
  position: relative;
  padding: 0;
  margin: 0;
}
.overlay{
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10;
  background-color: rgba(0,0,0,0.85); /*dim the background*/
  padding: 0;
  margin: 0;
  
  
  color: white;
}
.overlay .inner
{
	position: relative;
	
	width: 50%;
	max-width: 600px;
	margin: 20px auto;
	
  top: 10%;
  height: 500px;
}	
	
.overlay .inner img
{
	max-width: 100%;
	height: auto;
	border: 2px solid gray;
	
}
.overlay .close {
    position: absolute;
    top: -12px;
    right: -10px;
    width: 30px;
    height: 30px;
    text-decoration: none;
    opacity: .9;
    z-index: 10;
    background: transparent url(http://www.edgarriceburroughs.com/wp-content/plugins/wordpress-popup/css/tpl/simple/img/close.png) no-repeat;
}