html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: #0a1520;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  display: flex;
  align-items: center;
  justify-content: center;
}

canvas {
  display: block;
  border-radius: 4px;
  box-shadow: 0 0 40px rgba(0,0,0,0.5);
}