.Kontakt {  background-attachment: fixed; background-image: url(Bilder/Soeben3_bg.jpg); background-repeat: no-repeat}
.Beispiel {  background-attachment: fixed; background-image: url(Bilder/critical%20sense_bg.jpg); background-repeat: repeat-y}
.konzept {  background-attachment: fixed; background-image: url(Bilder/Here-we-are_bg.jpg); background-repeat: repeat-y}
.Leistung {  background-attachment: fixed; background-image: url(Bilder/softwhere_bg.jpg); background-repeat: repeat-y}