body {
  background: #222;
  color: #fff;
  font-family: Arial, sans-serif;
  text-align: center;
}

#gameContainer {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 20px;
}

#pongCanvas {
  background: #333;
  border: 4px solid #fff;
  border-radius: 10px;
  box-shadow: 0 0 20px #000;
  display: block;
}