.btn-flotante {
  position: fixed;
  right: 24px;
  bottom: 24px;
  color: #fff;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  width: 60px;
}
.btn-flotante:hover {
  transform: translateY(-2px);
}
.btn-flotante:active {
  transform: translateY(0);
}