@media (min-width: 768px) {
body {
    background-position:center center;
    background-repeat:no-repeat;
    background-attachment: fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
}
.bgweiss {
    background-color:rgba(255,255,255,.95);
}
}