body {
    background: #fefefe;
    color: #222;
}

#diagram_outer {
  width: 95vw;
  height: 85vh;
  overflow: hidden;
  border-radius: 15px;
  border: 1px solid #ccc;
  box-shadow: 0px 0px 56px 11px rgba(0, 0, 0, 0.1);
}

#diagram {
  overflow: hidden;
}

#tooltip {
  pointer-events: none;
  background-color: #eee;
  border-radius: 10px;
  padding: .75em 1em;
  font-size: .8em;
  opacity: 0;
  transition: opacity .15s;
}