body {
  background: #111;
  margin: 0;
  padding: 0;
  min-height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
}

canvas {
  display: block;
  margin: 40px auto 0 auto;
  border-radius: 16px;
  box-shadow: 0 0 40px #222;
}