@keyframes line {
    0% {
        background-position-x: 0;
    }

    100% {
        background-position-x: 20000px;
    }
}
    .backlines {
        animation: line 1000s linear infinite;
        background-repeat: repeat-x;
        background-position: bottom;
        background-size: auto 7rem;
        background-image: url("../images/upper-layout.svg");
        height: 7rem;
    }