.sliding {
    background: url('../assets/test.png') repeat-x;
    height: 500px;
    width: 3384px;
    animation: slide 60s linear infinite;
  }

  @keyframes slide{
    0%{
      transform: translate3d(0, 0, 0);
    }
    100%{
      transform: translate3d(-1692px, 0, 0);
    }
  }

<div class="wrap">
    <div class="sliding">
</div>