1, 196, 241, 0.9);
  color: white;
  border: none;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  z-index: 1000;
  transform: translateY(15px) scale(0.9);
}

#back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

#back-to-top svg {