html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  background: rgb(58,65,78);
}

canvas {
  display: block;
  width: 100vw;
  height: 100vh;
  object-fit: contain;
}