body {
  font-family: Arial, sans-serif;
  background: #f7f9fc;
  margin: 0;
  padding: 0;
  text-align: center;
}

.container {
  width: 90%;
  margin: auto;
  padding: 20px;
}

canvas {
  margin-top: 20px;
  background: #fff;
  border: 1px solid #ccc;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}