.star {
  position: absolute;
  width: 2px;
  height: 2px;
  background: white;
  border-radius: 50%;
  opacity: 0;
  animation: twinkle 2s infinite;
  z-index: 1;
}

@keyframes twinkle {
  0%, 100% { opacity: 0; }
  50% { opacity: 1; }
}