.scroll-top-btn {
  position: fixed;
  bottom: 25px;
  right: 25px;
  width: 45px;
  height: 45px;
  border-radius: 50%;
  background: #000;
  color: #fff;
  font-size: 22px;
  border: none;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0.8;
  transition: opacity 0.2s ease;
}

.scroll-top-btn:hover {
  opacity: 1;
}