* { margin: 0; padding: 0; box-sizing: border-box; }
html, body {
  width: 100%;
  height: 100%;
  background: #0a0a18;
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  overflow: hidden;
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
}
#game {
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
canvas {
  display: block;
  max-width: 100%;
  max-height: 100%;
}