html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000;
}

body {
  display: grid;
  place-items: center;
}

#gameCanvas {
  display: block;
  width: 100vw;
  height: 100vh;
  background: #000;
  image-rendering: auto;
  outline: none;
}