body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  color: #000000;
}

.boton {
  position: fixed;
  bottom: 20px;
  right: 20px;
  padding: 10px 20px;
  font-size: 16px;
  background-color: #3c763d;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: opacity 0.3s ease;
}

.boton.oculto {
  opacity: 0;
  pointer-events: none;
}

.boton:hover {
  background-color: #7ce053;
}