html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden; /* prevent scrollbars when in fullscreen or resizing */
  touch-action: manipulation; /* improve tap responsiveness */
  background: #000; /* ensure no white shows through transparent canvas */
  overscroll-behavior: none;
}

canvas {
  display: block;
  position: fixed;
  inset: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
  width: 100%;
  height: 100%;
  background: transparent; /* rely on sketch background */
}