.jumbotron {
    margin-bottom: 0px;
    background-image: url("../images/akt_marcel_vor_wand-uZGZpN-.jpg");
    background-position: 0% 25%;
    background-size: cover;
    background-repeat: no-repeat;
    color: white;
    text-shadow: black 0.3em 0.3em 0.3em;
}

/* .image-bg-fluid-height, */

.image-bg-fixed-height {
    text-align: center;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    background-size: cover;
    -o-background-size: cover;
}

.image-bg-fluid-height {
    background-repeat: no-repeat;
    background-position: center center;
    background-attachment: scroll;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
    padding-bottom: 33%;
    max-height: 640px;
}