.background {
  fill: none;
  pointer-events: all;
  border: #aaa;
}

h1 {
  font-size: 2em;
  text-align: center;
}

#regions {
  fill: #aaa;
}

#zones {
  fill: #aaa;
}

#regions .active {
  display: none;
}

#zones .active {
  display: none;
}

#region-borders {
  fill: none;
  stroke: black;
  stroke-width: 0.5px;
  stroke-linejoin: round;
  stroke-linecap: round;
  pointer-events: none;
}

.zone-boundary {
  fill: lightslategray;
  stroke: #fff;
  stroke-width: 0.5px;
}

.region:hover {
  fill: orange;
}

.zone-boundary:hover {
  fill: lightgreen;
}

div.tooltip {
  position: absolute;
  text-align: center;
  width: 200px;
  height: 30px;
  padding: 2px;
  font: 24px sans-serif;
  border: 0px;
  pointer-events: none;
}