body, html {
  padding: 0;
  margin: 0;
  height: 100%;
}
svg {
  width: 100%;
  height: 100%;
  background: white;
}

.node circle {
  fill: #333;
  stroke: white;
}
.node text {
  font-family: sans-serif;
  font-size: 12px;
  text-anchor: middle;
}

.link {
  stroke: #CCC;
}