#backToTopBtn {
  position: fixed;
  bottom: 40px;
  right: 30px;
  width: 48px;
  height: 48px;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  z-index: 99999;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
}

#backToTopBtn.show {
  opacity: 1;
  visibility: visible;
}

#backToTopBtn:hover {
  transform: translateY(-4px);
}

/* Ensure image fills button properly */
#backToTopBtn img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 50%;
}