.divBg2{
    background-image: url("../images/back69.jpg");
    background-repeat: no-repeat;
    background-size: 100% 100%;
    width: 100%;
    height: 100vh;
    position: fixed;
    z-index: -1;
    opacity: 20%;
    top: 0;
}

@media (min-width:1024px) {
.divBg2{
    background-image: url("../images/back69.jpg");
    background-repeat: no-repeat;
    background-size: 100% 100%;
    width: 100%;
    height: 140vh;
    position: fixed;
    z-index: -1;
    opacity: 20%;
    top: 0;
}
}