body {
  margin: 0;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: radial-gradient(circle at center, #222, #000);
  font-family: Arial, sans-serif;
  overflow: hidden;
}

.scene {
  perspective: 800px;
}

#hello {
  font-size: 140px;
  color: #00ffcc;
  font-weight: bold;
  transform-style: preserve-3d;
  animation: spin3d 3s linear infinite;
  text-shadow:
    0 0 10px rgba(0,255,204,0.6),
    0 0 20px rgba(0,255,204,0.4),
    0 0 40px rgba(0,255,204,0.2);
}

@keyframes spin3d {
  from {
    transform: rotateX(0deg) rotateY(0deg);
  }
  to {
    transform: rotateX(360deg) rotateY(360deg);
  }
}