.alert {
    position: fixed;
    top: 10px;
    right: 10px;
    width: 300px;
    padding: 10px;
    border: 1px solid transparent;
    border-radius: 4px;
    font-size: 16px;
    text-align: center;
    z-index: 1000;
}

.alert-success {
    background-color: #d4edda;
    border-color: #c3e6cb;
    color: #155724;
}

.alert-danger {
    background-color: #f8d7da;
    border-color: #f5c6cb;
    color: #721c24;
}

/* Adicione transição para suavizar o aparecimento e desaparecimento */
.alert {
    transition: opacity 0.5s ease-in-out;
}