body {
  width: 2000px;
  height: 2000px;
}

.world {
  top: 200px;
  position: fixed;
  background-color: #ddd;
  width: 100px;
  height: 100px;
  display: block;
  z-index: 0;
}

.view {
  position: absolute;
  top: 0;
  left: 0;
  background-color: #FFDC00;
  width: 0;
  height: 0;
  display: block;
  z-index: 999;
}