.snowflake {
  position: fixed;
  top: 0;
  color: white;
  font-size: 1em;
  user-select: none;
  pointer-events: none;
  z-index: 9999;
  animation: fall linear infinite;
}

@keyframes fall {
  0% { transform: translateY(0) rotate(0deg); opacity: 1; }
  100% { transform: translateY(100vh) rotate(360deg); opacity: 0; }
}