#bg-css {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background-image: url(stage-staiger-913aa15a.webp), url(staiger_stage-4e8ec8bb.jpg);
    background-position: center, center;
    background-repeat: no-repeat, no-repeat;
    transition: ease all .5s;
}

/* Base sizes for foreground and background images */
#bg-css {
    background-size: auto, cover;
}

/* Extra small devices (phones, 600px and down) */
@media only screen and (max-width: 600px) {
    #bg-css {
        background-size: 80% auto, cover;
        background-position-x: calc((1920px - 900px) - 15em - 700px), 0px;
    }
}

/* Small devices (portrait tablets and large phones, 600px and up) */
@media only screen and (min-width: 600px) {
    #bg-css {
        background-size: 70% auto, cover;
        background-position-x: calc((1920px - 800px) - 15em - 700px), 0px;
    }
}

/* Medium devices (landscape tablets, 768px and up) */
@media only screen and (min-width: 768px) {
    #bg-css {
        background-size: 60% auto, cover;
        background-position-x: calc((1920px - 700px) - 15em - 700px), 0px;
    }
}

/* Large devices (laptops/desktops, 992px and up) */
@media only screen and (min-width: 992px) {
    #bg-css {
        background-size: 50% auto, cover;
        background-position-x: calc((1920px - 500px) - 15em - 700px), 0px;
    }
}

/* Extra large devices (large laptops and desktops, 1200px and up) */
@media only screen and (min-width: 1200px) {
    #bg-css {
        background-size: 40% auto, cover;
        background-position-x: calc((1920px - 300px) - 15em - 700px), 0px;
    }
}

/* Very large devices (1400px and up) */
@media only screen and (min-width: 1400px) {
    #bg-css {
        background-size: 30% auto, cover;
        background-position-x: calc(1920px - 15em - 700px), 0px;
    }
}