body {
  background: radial-gradient(circle at center, #1a2c38 0%, #0d151b 80%);
  color: #fff;
  text-align: center;
  font-family: 'Arial', sans-serif;
  margin: 0;
  padding: 0;
}

h1 {
  font-family: 'Press Start 2P', cursive;
  font-size: 2em;
  color: rgb(24, 111, 232);
  text-shadow: 0 0 10px rgb(24, 111, 232), 0 0 20px rgb(24, 111, 232);
}

#pongCanvas {
  background: radial-gradient(circle at center, #222 0%, #000 100%);
  display: block;
  margin: 0 auto;
  border: 4px solid rgb(24, 111, 232);
  box-shadow: 0 0 25px rgb(24, 111, 232), 0 0 50px rgb(24, 111, 232) inset;
  animation: glow 2s ease-in-out infinite alternate;
}

@keyframes glow {
  from { box-shadow: 0 0 15px rgb(24, 111, 232), 0 0 20px rgb(24, 111, 232) inset; }
  to   { box-shadow: 0 0 30px rgb(24, 111, 232), 0 0 40px rgb(24, 111, 232) inset; }
}