.body_wrapper {
    position: relative;
}

.body_wrapper::before {
    content: "";
    position: absolute;
    top: 0; 
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("../images/foto-web.jpg");
    background-size: cover;
    background-position: center;
    filter: blur(8px) brightness(70%);
    z-index: -1;
}