svg {
    width: 100vw;
    height: 100vh;
  }
  line {
    stroke: #999;
    stroke-opacity: 0.6;
  }
  circle {
    stroke: #fff;
    stroke-width: 1.5px;
    cursor: grab;
  }
  text {
    font: 12px sans-serif;
    pointer-events: none;
  }