body {
  font-family: Arial, sans-serif;
  text-align: center;
  background-color: #f4f4f9;
  margin: 0;
  padding: 0;
}
h1 {
  margin-top: 20px;
}
canvas {
  display: block;
  margin: 20px auto;
  background: #87ceeb;
  border: 1px solid #000;
}