.footer {
  position: fixed;
  bottom: 20px;
  width: 100%;
  text-align: center;
  opacity: 0.4;
  font-size: 0.9rem;
  letter-spacing: 1px;
  color: #ccc;
}
#kanji {
  position: fixed;
  top: 40px;
  left: 40px;
  font-size: 3rem;
  opacity: 0.1;
  animation: fade 10s ease-in-out infinite;
}
@keyframes fade {
  0%, 100% { opacity: 0; }
  50% { opacity: 0.03; }
}