body,
html {
  position: absolute;
  margin: auto 0;
  padding: 0;
  background-color: #000000;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
}
canvas {
  display: block;
  max-width: 100vw;
  max-height: 100vh;
}