body {
        font-family: 'Open Sans', sans-serif;
        font-size: 11px;
    }
    circle.dot.outlier {
        r: 7px;
        stroke: black;
        stroke-width: 2px;
        transition: all 200ms ease-in;
    }
    circle.dot {
      transition: all 200ms ease-out;
  }
  .axis path,
  .axis line {
    fill: none;
    stroke: #000;
    shape-rendering: crispEdges;
}

.d3-tip {
    line-height: 1;
    font-weight: bold;
    padding: 12px;
    background: rgba(0, 0, 0, 0.8);
    color: #fff;
    border-radius: 2px;
}

/* Creates a small triangle extender for the tooltip */
.d3-tip:after {
  box-sizing: border-box;
  display: inline;
  font-size: 10px;
  width: 100%;
  line-height: 1;
  color: rgba(0, 0, 0, 0.8);
  content: "\25BC";
  position: absolute;
  text-align: center;
}

/* Style northward tooltips differently */
.d3-tip.n:after {
    margin: -1px 0 0 0;
    top: 100%;
    left: 0;
}     
input[type=checkbox] {
  vertical-align: middle;
}