svg {
      width:800px;
      max-height:800px;
  border: 0px solid #999;
  overflow: hidden;
}

.node {
  white-space: nowrap;
}

.node rect,
.node circle,
.node ellipse {
  stroke: #333;
  fill: #fff;
  stroke-width: 1.5px;
}

.cluster rect {
  stroke: #333;
  fill: #000;
  fill-opacity: 0.1;
  stroke-width: 1.5px;
}

.edgePath path.path {
  stroke: #333;
  stroke-width: 1.5px;
  fill: none;
}
</style>

<style>
h1, h2 {
  color: #333;
}

textarea {
  width: 800px;
}

label {
  margin-top: 1em;
  display: block;
}

.error {
  color: red;
}