html {
    background: url(../images/BG.jpg) no-repeat right 80px fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
    height: 100%;
    min-height: 100%;
}

@media (max-width: 991px) {
    html {
        background-position: right 40px;
    }
}

.impressum-text {
    position: absolute;
    color: gray;
    width: 100%;
    text-align: center;
    bottom: 10px;
}