body:before {
    background-repeat: repeat;
    -webkit-animation: scroll 160s linear infinite;
    animation: scroll 30s linear infinite;
}
@-webkit-keyframes scroll {
    from { background-position: 0 0; }
    to   { background-position: -2400px 0; }
}
@keyframes scroll {
    from { background-position: 0 0; }
    to   { background-position: -2400px 0; }
}