svg {
  background: #F8F8F8;
  margin: 5px;
  border: 2px solid hsla(0, 100%, 0%, 0.2);
  border-radius: 10px;
}
* {
  vector-effect: non-scaling-stroke;
}
div.tree {
  display: inline-block;
}
h2 {
  margin: 10px 0 5px 5px;
}
h3 {
  margin: 5px 0 0 15px;
}
rect.node {
  fill: none;
  stroke: hsla(0, 100%, 0%, 0.2);
  stroke-width: 1;
  stroke-dasharray: 5;
}
path {
  fill: none;
  stroke: #BBB;
}