body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f4f9ff;
  color: #003366;
  margin: 0;
  padding: 20px;
  text-align: center;
}
.chart-container {
  width: 90%;
  max-width: 1000px;
  margin: 40px auto;
}