.node
{
    stroke: #fff;
    stroke-width: 1.5px;
}

.node:hover
{
    stroke: #000;
    stroke-width: 1.5px;
}

.link {
  stroke: #000;
}

.link:hover {
  stroke: red;
}

.label {
  fill: white;
  text-anchor: middle;
  alignment-baseline: central;
  font-family: monospace;
  cursor: default;
}

div.tooltip
{
    position: absolute;
    text-align: left;
    padding: 8px;
    font: 12px sans-serif;
    background: #000;
    color: #ddd;
    border: solid 1px #aaa;
    border-radius: 4px;
    pointer-events: none;
    z-index: 10;
}

#d3graph
{
    position: absolute;
    top: 20px;
    left: 20px;
    z-index: 0;
}