html,
body {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  color: rgb(255, 255, 255);
  background-color: rgb(0, 0, 0);
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0;
  padding: 0;
  font-size: 0.8em;
  /* overflow: hidden; */
}

canvas {
  object-fit: contain;
  max-height: 100%;
  max-width: 100%;
}

#fullScreen {
  display: flex;
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  justify-content: center;
  align-items: center;
}

#fullScreen canvas {
  object-fit: contain;
  max-height: 100%;
  max-width: 100%;
}