body {
  margin: 0;
  position: relative;
  overflow: hidden;
  width: 100vw;
  height: 100vh;
}
svg {
  display: block;
  width: 100vw;
  height: 100vh;
}
.links line {
  stroke: #999;
  stroke-opacity: 0.6;
}
.nodes circle {
  stroke: aqua;
  stroke-width: 2px;
  fill: #fff;
}
.texts text {
  font-size: 16px;
  pointer-events: none;
  text-anchor: middle;
  fill: magenta;
  font-weight: bold;
}

.links line,
.nodes circle,
.labels text {
  transition: opacity 150ms linear;
}