.modal {
    position: fixed;
    inset: 0;
    display: none; /* oculto por defecto */
    justify-content: center;
    align-items: center;
    background: rgba(0,0,0,.5);
}

.modal.active {
    display: flex;
}
.modal-terminos {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: rgba(0,0,0,.5);
    display: flex;
    justify-content: center;
    align-items: center;
}
.modal-terminos .contenido {
    background: white;
    width: 80%;
    max-height: 90vh;
    overflow-y: auto;
}