.banner-overlay{
    position: relative;
}

.banner-overlay::before{
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(70, 70, 70, 0.55); /* Gris semitransparente */
    z-index: 1;
}

.banner-overlay .container{
    position: relative;
    z-index: 2;
}