html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000;
  font-family: "Segoe UI", "Malgun Gothic", sans-serif;
}

#game {
  display: block;
  width: 100vw;
  height: 100vh;
  cursor: pointer;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
}