html, body {
  background-color: #f8f8f8;
  margin: 0;
  padding: 0;
}
body {
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
canvas {
  box-shadow: 0px 0px 20px 0px rgba(0,0,0,0.5);
  display: block;
  margin: auto;
  max-height: 100%;
  max-width: 100%;
  touch-action: none;
  vertical-align: middle;
}