:root {
  --height: 55mm;
  --width: 91mm;
  --depth: 0.24mm;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
}

body {
  /* Checkered board pattern */
  background-image: repeating-conic-gradient(#F8F8F8 -90deg 0deg, #E8E8E8 0deg 90deg);
  background-size: 16px 16px;

  /* Center item */
  display: flex;
  justify-content: center;
  align-items: center;

  /* Perspective */
  perspective: 300mm;
  perspective-origin: center;
}