body {
  padding:0px;
  margin:0px;
}
.fill {
  position:absolute;
  left:0px;
  right:0px;
  bottom:0px;
  top:0px;
}

#main {
  position:absolute;
  margin-left:auto;
  margin-right:auto;
  height:100%
}

#goFullScreen {
  opacity: 0.7;
  font: 10px sans-serif;
  text-align: center;
  position : absolute;
  right :5px;
  top:5px;
  width:48px;
  height:32px;
  border:2px solid black;
}

#goFullScreen:hover {
  opacity: 1;
  border:2px solid black
}