body {
  background: lightgrey;
  margin: 0;
  overflow:hidden;
}

img {
  display: block;
  width: 100%;
}

.scene {
  width:100%;
  height:100%;
  margin: 0 auto;
  padding: 0;
}
.layer {
  width:100%;
  height:100%;
  border:0px solid red;
}

.layer:nth-child(1) {
  opacity: 1;
}
.layer:nth-child(2) {
  opacity: 1;
}
.layer:nth-child(3) {
  opacity: 1;
}
.layer:nth-child(4) {
  opacity: 1;
}
.layer:nth-child(5) {
  opacity: 1;
}
.layer:nth-child(6) {
  opacity: 1;
}

#cross {
  position:absolute;
  top:50%;
  left:50%;
  transform:translate(-50%, -50%);
  z-index:9999;
}