CSS3 animation 无缝滚动，鼠标悬浮暂停demo效果：

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    body {
      margin: 0;
      padding: 0;
      background-color: #f7f7f7;
    }
    .box {
      width: 880px;
      height: 85px;
      margin: 200px auto;
      position: relative;
      overflow: hidden;
      border: 1px solid #ccc;
    }
    ul {
      width: 2250px;
      height: 85px;
      padding: 0;
      margin: 0;
      list-style: none;
      position: absolute;
      left: 0;
      animation: move 7s infinite alternate;
    }
    ul:hover {
      /* 控制动画执行状态 paused：暂停 running: 播放 */
      animation-play-state: paused;
    }
    li {
      float: left;
    }
    li img {
      width: 150px;
      height: 100%;
    }
    @keyframes move {
      0% {
        transform: translateX(0px);
      }
      100% {
        transform: translateX(-1370px);
      }
    }
  </style>
</head>
<body>
  <div class="box">
    <ul>
      <li><img src="DemoMaterial/animation/bg1.jpg"></li>
      <li><img src="DemoMaterial/animation/bg2.jpg"></li>
      <li><img src="DemoMaterial/animation/bg3.jpg"></li>
      <li><img src="DemoMaterial/animation/bg4.jpg"></li>
      <li><img src="DemoMaterial/animation/bg5.jpg"></li>
      <li><img src="DemoMaterial/animation/bg1.jpg"></li>
      <li><img src="DemoMaterial/animation/bg2.jpg"></li>
      <li><img src="DemoMaterial/animation/bg3.jpg"></li>
      <li><img src="DemoMaterial/animation/bg4.jpg"></li>
      <li><img src="DemoMaterial/animation/bg5.jpg"></li>
      <li><img src="DemoMaterial/animation/bg1.jpg"></li>
      <li><img src="DemoMaterial/animation/bg2.jpg"></li>
      <li><img src="DemoMaterial/animation/bg3.jpg"></li>
      <li><img src="DemoMaterial/animation/bg4.jpg"></li>
      <li><img src="DemoMaterial/animation/bg5.jpg"></li>
    </ul>
  </div>
</body>
</html>
demo 效果：