body {
  padding: 0px;
  margin: 0px;
}

img {
  display: none;
}

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

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

#goFullScreen {
  display:none;
  opacity: 0.1;
  font: 10px sans-serif;
  text-align: center;
  position: absolute;
  left: 5px;
  top: 5px;
  width: 48px;
  height: 32px;
  border: 2px solid black;
  background-color: bisque;
}

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