article:nth-child(1){
    background-image: url(../img/h/screenshot1.de.jpg);
}

article:nth-child(2){
    background-image: url(../img/h/screenshot2.de.jpg);
}

article:nth-child(3){
    background-image: url(../img/h/screenshot3.de.jpg);
}

footer {
    background-image: url(../img/h/appstore.de.jpg);
}