.alerta {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%); /* Centra horizontalmente */
    background-color: rgba(19, 200, 19, 0.949);
    border: 2px solid lightgreen;
    padding: 15px 25px;
    border-radius: 12px;
    font-family: Arial, sans-serif;
    font-size: 16px;
}