body {
  font-family: Arial, sans-serif;
  background: #111;
  color: #eee;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}
#game {
  max-width: 600px;
  padding: 20px;
  background: #222;
  border-radius: 8px;
}