.node circle {
  fill: #fff;
  stroke: steelblue;
  stroke-width: 3px;
}

.node text {
  font: 12px;
}

.link {
  fill: none;
  stroke: #ccc;
  stroke-width: 2px;
}

.action {
  margin: 0 10px;
  display: inline-block;
}

h1 {
  margin-left: 10px;
}