h1 {
  color: black;
  font-family: arial;
  font : 20px sans-serif;
  font-weight: bold;
}

h2 {
  color: blue;
  font-family: arial;
  font: 16px sans-serif;
}

body {
  font: 10px sans-serif;
}

.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}


.tooltip {
  position: absolute;
  text-align: center;
  width: 60px;
  height: 12px;
  padding: 8px;
  margin-top: -20px;
  font: 10px sans-serif;
  background: #ddd;
  pointer-events: none;
}