* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  width: 100vw;
  height: 100vh;
  background-color: #151515;
  overflow: hidden;
}

.node {
  cursor: pointer;
}

.node text {
  fill: #fff;
  user-select: none;
  font-size: 24px;
  filter: drop-shadow(0 0 1px #000);
}

.node.first-node circle {
  filter: drop-shadow(0 0 20px #fff);
}