NCPopDensity.css

body {
  text-align: center;
}

/*make the labels inside the tooltip aligned*/

div#tooltip #left {
  float: left;
  width: 160px;
  text-align: left;
}

div#tooltip #right {
  float: left;
  width: 160px;
  text-align: right;
}

div#tooltip #middle {
  float: left;
  width: 10px;
  text-align: center;
}

/*tooltip css*/

div#tooltip {
  position: absolute;
  left: -100px;
  top: -100px;
  /*not specifying an intial value makes the whole graph shift a little */
  width: 330px;
  height: 50px;
  padding: 10px;
  color: black;
  background-color: #f3f3f3;
  border-radius: 5px 5px 5px 5px;
  font-family: Helvetica;
  font-size: 15px;
  line-height: 1rem;
}

#select {
  position: absolute;
  left:50%;
  top:70px;
  margin-left: -78px;
  padding: 10px;
  outline: none;
}

svg{
  margin-top:30px;
}