.node {
  fill: rgba(40,40,40,1);
  font-size: x-small;
}

.node:hover {
  fill: red;
}

.link {
  fill: none;
  stroke: rgba(40,40,40,1);
  stroke-opacity: 0.2;
  pointer-events: none;
}

.link.source, .link.target {
  stroke-opacity: 1;
  stroke-width: 2px;
}

.node.target {
  fill: blue !important;
}

.link.source {
  stroke: blue;
}

.node.source {
  fill: blue;
}

.link.target {
  stroke: blue;
}