body {
  font-family: 'Source Sans Pro', sans-serif;
  font-weight: 300;
  text-align: center;
  background-color: #eeeeee;
}

svg {
  background-color: white;
}

b {
  font-weight: 900;
}

.node {
  stroke: silver;
  stroke-width: 1px;
}

.link {
  fill: none;
  stroke: silver;
  stroke-width: 1px;
}

.selected {
  stroke: red !important;
}