.bg-image {
    background-image: url("Chiesa_di_Mestrino.jpg");
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: -1;
    opacity: 0.5;
    background-repeat: no-repeat;
    background-size: cover;
    filter: saturate(0.5);
}