* {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000;
  color: #fff;
}
body {
  display: grid;
  place-items: center;
}
main {
  display: grid;
  place-items: center;
}
canvas {
  display: block;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  outline: none;
}
#error {
  font: 18px monospace;
  max-width: 36em;
  padding: 2em;
  line-height: 1.6;
}