.box-not {
  padding: 20px;
  background-color: #f44336;
  color: white;
  opacity: 1;
  transition: opacity 0.6s;
  margin-bottom: 15px;
}

.box-not.successo {background-color: #04AA6D;}
.box-not.notizia {background-color: #2196F3;}
.box-not.pericolo {background-color: #ff9800;}
.box-not.errore {background-color: #f44336;}