:root {
  --dimension: min(100vw, 100vh);
  --tile: calc(min(100vw, 100vh) / 8);
}

body {
  margin: 0;
  background: black;
  overflow: hidden;
}

#opepen {
  position: relative;

  & > svg {
    position: absolute;
    width: var(--dimension);
    height: var(--dimension);
  }
}