.float {
  position: fixed;
  bottom: 0;
  font-size: 1.6rem;
  opacity: 0.8;
  animation: rise 6s ease-in infinite;
  pointer-events: none;
}

@keyframes rise {
  0% { transform: translateY(0); opacity: 1; }
  100% { transform: translateY(-120vh); opacity: 0; }
}