body {

  background-color: lightgray;
  display: grid;
  margin: 0;

  /* leave it to hide the scrollbars */
  overflow: hidden;
}

body, html {
  height: 100vh;
}

svg, #wrapper {
  --w: min(100vh, 100vw);
  background: #FFF;
  margin: auto;
  height: var(--w);
  width: var(--w);
}

image {
  image-rendering: crisp-edges;
  image-rendering: pixelated;
}