html, body {
  margin: 0;
  padding: 0;
  height: 100vh;
  background-color: black;

  display: flex;
  justify-content: center;  /* Centre horizontalement */
  align-items: center;      /* Centre verticalement */
}
canvas {
  display: block;
  //margin: 0 auto;
}

canvas:focus {
  outline: none; /* supprime le cadre blanc lors du focus */
}