body { 
    font-family: sans-serif;
    background-color: black;
}

svg {
    filter: invert(100%);     /* go dark */
}

line { 
    stroke: #aaa;
    stroke-width: 1;
}

text.label {
    text-anchor: middle;
    alignment-baseline: middle;
    fill: white;
}

.goalNode { 
  fill-opacity: 1;
  stroke-width: 5;
  stroke-opacity: 1;
}

.elementNode {
  fill-opacity: 0.8;
}