#scrollToTopBtn {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background-color: #13a2e4;
  color: white;
  border: none;
  outline: none;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  font-size: 24px;
  cursor: pointer;
  box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.2);
  display: none; /* Caché au départ */
  transition: all 0.3s ease;
  z-index: 9999;
}

#scrollToTopBtn:hover {
  background-color: #0e84bb;
  transform: scale(1.1);
}