html {
background: url(Bilder/hartriegel.jpg);
background-repeat: no-repeat;
background-size: cover;
/*background-position: center center;*/
background-attachment: fixed;
}

@media (max-width: 980px) {
html {
background: url(Bilder/hartriegel500.jpg);
background-repeat: no-repeat;
background-size: cover;
}
}
@media (max-width: 500px) {
html {
background: url(Bilder/hartriegel500.jpg);
background-repeat: no-repeat;
background-size: cover;
}
}
@media (max-width: 380px) {
html {
background: url(Bilder/hartriegel300.jpg);
background-repeat: no-repeat;
background-size: cover;
}
}