body {
    background: url(../img/blue_network_bg.jpg);
    background-repeat: no-repeat;
}
.box {
    width: 100%;
    position: relative;
}
#scene2, #scene3 {
    position: absolute;
    width: 100%;
    visibility: hidden;
}

@media only screen and (min-width: 1920px)  {

    .box {
        width: 1920px;
    }

}