body {
  background: #1a1a1a;
  color: #fff;
  font-family: Arial, Helvetica, sans-serif;
  text-align: center;
  margin: 0;
  padding: 0;
}

h1 {
  margin-top: 30px;
  margin-bottom: 10px;
  letter-spacing: 2px;
}

#pong {
  background: #222;
  display: block;
  margin: 20px auto;
  border: 2px solid #fff;
  box-shadow: 0 0 10px #000;
}