body {
  margin:0;
  font-family:sans-serif;
  background:#070716;
  overflow:hidden;
  color:white;
}

#tooltip {
  position:absolute;
  background:rgba(0,0,0,0.8);
  padding:8px;
  border-radius:6px;
  font-size:13px;
  max-width:220px;
  display:none;
  pointer-events:none;
}

circle.central {
  fill: white;
  r: 10;
  filter: drop-shadow(0 0 15px white);
}

circle.small {
  fill: rgba(255, 255, 255, 0.535);
  r: 4;
  opacity:0.8;
  filter: drop-shadow(0 0 5px white);
}

line {
  stroke: #0ff;
  stroke-opacity: 0.1;
  stroke-linecap: round;
}