#buy-now-btn {
  position: fixed;
  left: -120px;
  top: 50%;
  transform: translateY(-50%);
  background-color: #000;
  color: #e59d02;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: bold;
  border-radius: 25px;
  text-decoration: none;
  z-index: 9999;
  box-shadow: 0 4px 6px rgba(0,0,0,0.3);
  transition: left 0.6s ease-in-out;
  white-space: nowrap;
}

#buy-now-btn.show {
  left: 10px;
}