body {
  background-color: lightblue;

  margin: 0;
  padding: 0;

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

canvas {
  width: 100% !important;
  height: min(100vh, 100vw) !important;
  max-width: min(100vh, 100vw);
  max-height: min(100vh, 100vw);
}