div.fg-tooltip {
  z-index:1;
  position: absolute;
  display: inline-block;
  text-align: center;
  padding: 2px;
  font: 12px sans-serif;
  background: lightsteelblue;
  border: 0px;
  border-radius: 8px;
  pointer-events: none;
}

.zoom {
  cursor: move;
  fill: none;
  pointer-events: all;
}

.fg-nodes {
  opacity: 1;
  stroke-opacity: 1;
  z-index:1500;
}

.fg-links {
  stroke-opacity: 1;
}

.fg-nodelink {
  opacity: 1;
  stroke-opacity: 1;
}

.fg-nodes-pies {
  opacity: 1;
  stroke-opacity: 1;
  z-index: 1500;
}

.fg-nodes-pies g path {
  /*box-shadow: 2px 2px;*/
  /*stroke: darkgreen;*/
  stroke-width: none;
}

/* css for control element */
.fg-control-container {
  float: right;
  position: absolute;
  bottom: 5px;
  right: 5px;
  display: block;
  box-sizing: border-box;
  z-index: 1200;
}
.fg-control-container>div {
  width: 25px;
  height: 25px;
  overflow: hidden;
  display: inline-block;
}

.fg-control-container .icon {
  width: 100%;
  height: 100%;
  cursor: pointer;
}

.fg-control-container .icon:hover {
  fill: blue;
}