body {
  background: #f5f5f5;
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  text-align: center;
}

header {
  background: #222;
  color: #fff;
  padding: 1rem;
}

.stats {
  display: flex;
  justify-content: space-around;
  margin: 1rem 0;
}

.stat-card {
  background: white;
  padding: 1rem 2rem;
  border-radius: 10px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.charts {
  margin: 1rem;
}

canvas {
  background: white;
  margin: 1rem auto;
  width: 90%;
  max-width: 600px;
}