body {
    display: flex;
    flex-direction: column;
    background-color: black;
    overflow-x: hidden;
    background-image: url('../sprite/image.PNG');
    background-size: 9em;
    background-repeat: repeat;
    animation: cookiemovebackground 120s linear infinite;
    -webkit-animation: cookiemovebackground 120s linear infinite;
}

@keyframes cookiemovebackground {
    from { background-position: 0 0; }
    to { background-position: 100% 100%; }
}