body {
  font-family: 'Arial', sans-serif;
  background: #f3f4f6;
  margin: 0;
  padding: 20px;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  background: white;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.chart-container {
  margin: 20px 0;
}

button {
  background: #3b82f6;
  color: white;
  border: none;
  padding: 10px 15px;
  margin: 5px;
  border-radius: 5px;
  cursor: pointer;
}

button:hover {
  background: #2563eb;
}