header{
  position: sticky; 
  background-color: rgb(255, 255, 255) !important; 
  top: -1px;
  z-index: 20;
  box-shadow: 0px 10px 7px 0px rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(0, 0, 0, 0.00)
}

.login{
  max-width: 500px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(0, 0, 0, 0.00);
  border-radius: 10px;
}


.button{
  background: none;
  border: none;
  cursor: pointer;
  text-decoration: underline;
  font-weight: bolder;
}

.ocultar{
  display: none;
}

.mostrar{
  display: block;
}