html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

.container {
  position: relative;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}

canvas {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}