body:before {
    content: ' ';
    display: block;
    position: absolute;
    left: 0;
    top: 8%;
    width: 100%;
    height: 100%;
    z-index: -1000;
    opacity: 0.2;
    background-image: url("../img/nuevologo.jpg");
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
}

@media (min-width: 325px) and (max-width: 767px) {
  
    body:before {
        top: 11%;
        background-position: initial;
    }

}