.marvin-sackgasse {
    background-image: url('sackgasse.png');
}

.marvin-404 {
    background-image: url('vierhundertvier.png');
}


.marvin-sackgasse, .marvin-404 {
    background-repeat: no-repeat;
    float: left;
    position: fixed;
    left: 0;
    bottom: 0;
    width: 50%;
    background-size: contain;
    height: 50%;
    background-position: bottom left;
}

div.hinweis p {
    text-align: center;
    font: 2.4rem Inconsolata, monospace;
}