.iso.outline {
  stroke: #333;
  fill: none;
  vector-effect: non-scaling-stroke;
}

.label {
  pointer-events: none;
  text-anchor: middle;
  font-family: Impact;
}

.pipedon:hover .label {
  fill: black;
}
.pipedon:hover .face {
  fill: yellow;
}

.hidden {
  display: none;
}