body {
  margin: 0;
  background: black;
  color: white;
  font-family: Arial;
}

/* VIEWPORT */
#viewport {
  width: 800px;
  height: 400px;
  overflow: hidden;
  position: relative;
  margin: 40px auto;
  border: 2px solid white;
}

/* WORLD (scroll container) */
#world {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
}

/* BACKGROUND LAYER */
.layer {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  z-index: 0;
  pointer-events: none;
}

/* OBJECTS */
.object {
  position: absolute;
  cursor: pointer;
  z-index: 2;
}

.object:hover {
  outline: 2px solid yellow;
  box-shadow: 0 0 10px yellow;
}

/* TOOLTIP */
#tooltip {
  position: fixed;
  pointer-events: none;
  background: black;
  border: 1px solid white;
  padding: 4px 8px;
  font-size: 12px;
  display: none;
  z-index: 1000;
}

/* PANEL */
#panel {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 260px;
  min-height: 120px;
  background: black;
  border: 1px solid white;
  padding: 10px;
  z-index: 1000;
}

button {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
}
#left { left: 10px; }
#right { right: 10px; }