body {
  background-color: gray;

  /* leave it to hide the scrollbars */
  overflow: hidden;
}
html, body {
  margin: 0; padding: 0;
  height: 100vh;
}
canvas.p5Canvas {
  width: 100% !important;
  height: 100% !important;
  object-fit: contain;
  object-position: center;
}