:root, body {
  margin: 0;
  padding: 0;
}
body {
  background-color: gray;
  /* leave it to hide the scrollbars */
  overflow: hidden;
  height: 100%;
}
main {
  display: flex;
}
.p5Canvas {
  position: absolute;
  top: 50%;
  left: 50%;
  height: 90% !important;
  width: auto !important;
  max-width: 90%;
  max-height: calc(90vw / var(--aspectRatio, 1.666666667));
  transform-origin: center;
  transform: translate(-50%, -50%) rotate(var(--rotation, 1deg));
  box-shadow: 1em 1em 3em rgba(0, 0, 0, 0.25);
  border-radius: 2px;
}