.background {
    width: 7680px;

    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: -9999;

    background-color: black;
    background-image: url('/images/stars.png');
    background-position-x: -2559px;
    background-repeat: repeat;

    animation: scroll-bg 120s linear infinite;
    -webkit-animation: scroll-bg 120s linear infinite;
}

@keyframes scroll-bg {
    0% {
        background-position-x: 0;
    }
    100% {
        background-position-x: 2559px;
    }
}