body {
  font-family: sans-serif;
  background-color: #f2f2f2;
  margin: 0;
  padding: 0;
}

h1 {
  text-align: center;
  margin-top: 50px;
}

#chart {
  width: 100%;
  max-width: 800px;
  margin: auto;
  margin-top: 50px;
}
