#ML-chart {
  height: 500px;
  font: 13px sans-serif;
}
.node rect {
  fill-opacity: .9;
  shape-rendering: crispEdges;
  stroke-width: 0;
}
.node text {
  text-shadow: 0 1px 0 #fff;
}
.link {
  fill: none;
  stroke: #000;
  stroke-opacity: .2;
}