.back-to-games {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 50;
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid #111;
  border-radius: 999px;
  background: #fff;
  color: #111;
  font: 600 12px/1 Arial, sans-serif;
  letter-spacing: .08em;
  text-decoration: none;
  text-transform: uppercase;
  box-shadow: 0 0 0 2px #fff, 0 8px 24px rgba(0,0,0,.24);
  animation: library-pulse 2.2s ease-in-out infinite;
  transition: background .2s ease, color .2s ease, transform .2s ease;
}
.back-to-games:hover,
.back-to-games:focus-visible { background: #111; color: #fff; transform: translateY(-2px); outline: none; }
@keyframes library-pulse {
  0%, 100% { box-shadow: 0 0 0 2px #fff, 0 8px 24px rgba(0,0,0,.24); }
  50% { box-shadow: 0 0 0 2px #fff, 0 0 0 5px rgba(17,17,17,.2), 0 10px 28px rgba(0,0,0,.3); }
}
@media (max-width: 600px) {
  .back-to-games { right: 14px; bottom: 14px; min-height: 38px; padding: 0 13px; }
}