.banner-img {
    background-image: url('../img/banner-ofi-9.png');
    height: 800px;
}

@media screen and (max-width: 768px) {
  /* Estilos solo para móviles y tablets */
  .banner-img {
    background-image: url('../img/banner-mobile.png');
    height: 900px !important;
  padding: 0 !important;
  overflow: hidden;
}
}