.overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.6);
        display: none;
        justify-content: center;
        align-items: center;
        z-index: 9999;
    }

    /* Caja del popup */
    .popup {
        background: #626161;
        border-radius: 10px;
        max-width: 500px;
        padding: 30px;
        text-align: left;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
        animation: fadeIn 0.3s ease;
    }

    @keyframes fadeIn {
        from { transform: scale(0.9); opacity: 0; }
        to { transform: scale(1); opacity: 1; }
    }

    .popup h4 {
        color: #25b218;
        margin-bottom: 15px;
    }

    .btn-cerrar {
        display: block;
        margin: 20px auto 0;
        background-color: #29fd0d;
        color: rgb(0, 0, 0);
        border: none;
        padding: 10px 25px;
        border-radius: 5px;
        cursor: pointer;
    }

    .btn-cerrar:hover {
        background-color: #1aa80dad;    
    }