#legend {
  width: 20px;
  height: 50vh;
  background: linear-gradient(
    #ff0000,
    #ffff00 20%,
    #00ff00 50%,
    #00ffff 80%,
    #0000ff
  );
  position: absolute;
  right: 80px;
  bottom: 25vh;
  z-index: 2; /* On top of the viewer */
}

#legend .marker {
  width: 10px;
  height: 1px;
  margin-left: 20px;
  background: white;
  position: relative;
}

#legend .marker p {
  position: absolute;
  color: white;
  font-size: 14px;
  top: -7px;
  left: 15px;
  margin: 0px;
  font-family: "Courier New";
  font-weight: 500;
}