*{margin:0; padding:0;}

.clearfix {
  *zoom: 1;
}
.clearfix:before,
.clearfix:after {
  display: table;
  content: "";
  line-height: 0;
}
.clearfix:after {
  clear: both;
}

html {
background:#000;
}

#main_img{
position:fixed;
top:0;
bottom:0;
height:100%;
}
.centered {
  position: fixed;
  top: 0;
  left: 50%;
  -ms-transform: translate(-50%, 0px); /* IE 9 */
    -webkit-transform: translate(-50%, 0px); /* Chrome, Safari, Opera */
  transform: translate(-50%, 0px);
}