html, body {
  background-color: #eee;
  height: 100%;
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
}

canvas {
  background-color: white;
  box-shadow: 0px 0px 20px rgba(0, 0, 0, 0.1);
  max-width: 100%;
}