html, body {
  height: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: #222;
  color: #fff;
  font-family: Arial, sans-serif;
}

#game {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100vw;
  height: 100vh;
  min-width: 100vw;
  min-height: 100vh;
  max-width: 100vw;
  max-height: 100vh;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1;
}

canvas {
  display: block;
  width: 100vw !important;
  height: 100vh !important;
  max-width: 100vw !important;
  max-height: 100vh !important;
  min-width: 100vw !important;
  min-height: 100vh !important;
  margin: 0 auto;
  background: #222;
}