html, body {
  margin: 0;
  padding: 0;
}
canvas {
  display: block;
  width: 100vw;
  height: 100vh;
  object-fit: contain; /* or "cover" depending on desired crop behavior */
}
#sketch-holder {
  display: block;
  width: 100vw;
  height: 100vh;
  object-fit: contain; /* or "cover" depending on desired crop behavior */
}