.fundo{
    /* background-image: url(../images/fundo1.jpg)!important; */
    background-image: linear-gradient(to right, rgb(0, 174, 255), rgb(0, 102, 255)) !important;
    z-index:-1;
    position:absolute;
    left:0;
    top:0;
    /* content: url('path/to/image.ext'); */
    /* opacity:0.4; */
}