* {
  padding: 0;
  margin: 0;
  list-style: none;
 }
 html,body {
  height: 100%;
 }
 .main {
  height: 100%;
  width: 100%;
  -webkit-background-size: cover;
  background-size: cover;
  overflow: hidden;
  position: relative;
 }
 .main ul {
  height: 100%;
  width: 3920px;
  position: absolute;
  top: 0;
  left: 0;
  animation: dong 50s linear infinite;
 }
 @keyframes dong {
  0% {
   left: 0;
  }
  100% {
   left: 1920px;
  }
 }
 .main ul li {
  height: 100%;
  width: 100%;
  background: url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg63n01W3LqIRLUbrcAstuBLppfW6VLXtbdsxw2bh5XWYTZMzSc8XKtM6euF6CRaWkfJEFcdlz1VTmK4OdREUeHTZKcpivFqbIf4K9zO8h-y37-FrfjwXY3Ip-er-8AYRBs4Wyz7kYxP3E/s1600/2.jpg);
  float: left;
  margin-left: -2000px;
 }
 .wk {
  z-index: 999;
  width: 200px;
  height: 180px;
  background: url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEixBZRORvG_zu-ezp9U91hranDk2wtKcBvGbHybU3NXDnMmkQdEywc3cqwz6GyFtTSSDfwYsltvT3QDuAUkSHmiiQHoxrxtUIqIE_GmVR4pEP1lGFO2cokkV7yGJlrcD2XcvnufUvR0jYY/s1600/west_01_3ca39fe.png) 0 0 no-repeat;
  /*margin: 400px auto;*/
  position: absolute;
  top: 55%;
  left: 20%;
  animation: wkzou 1s steps(8) infinite;
 }
 @keyframes wkzou {
  to {
   background-position: -1600px 0;
  }
 }
 .bj {
  z-index: 999;
  width: 200px;
  height: 180px;
  background: url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjyWVSgxdo0UKwWH8FgdJGrwUQqjVFSN9O7x9OkdnEO1zivvzX3TQftFjX5DHJsbPrm3PZiGrCk1vpSgAHVJrzb9zH5b6Fa6lV6AmBGgvfSdzCUTPTROYSxi1DiwBzXwMe44GZ5OXlYdks/s1600/west_02_47bad19.png) 0 0 no-repeat;
  /*margin: 400px auto;*/
  position: absolute;
  top: 55%;
  left: 35%;
  animation: bjzou 1s steps(8) infinite;
 }
 @keyframes bjzou {
  to {
   background-position: -1600px 0;
  }
 }
 .ts {
  z-index: 999;
  width: 170px;
  height: 240px;
  background: url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjWG6SCTOcd8088yePttLc9yeA7-gtOVF-wm3r-425rjO7Vvsr0z5w6jFgCm7ruGD2slrYmp1Y2F7KoxDqCxPxPYaVxkE9bu-GqK7iQvSn0X_KJS3ABVQH5Ei6nslBG_1g6kZurRWelBgk/s1600/west_03_f962447.png) 0 0 no-repeat;
  /*margin: 400px auto;*/
  position: absolute;
  top: 50%;
  left: 50%;
  animation: tszou 1s steps(8) infinite;
 }
 @keyframes tszou {
  to {
   background-position: -1360px 0;
  }
 }
 .ss {
  z-index: 999;
  width: 210px;
  height: 200px;
  background: url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjmWtAuUKkOuQvsPiauXfsYV7lZgsAavMVMEeS9wLARjlFSIfKx31SkOkxfouz4_scFPtpcurgATBHdwYqPDlrZkcA2dYgj7azxniirsm279qAqxg_6wFAcquQq4gOwBhsHVH7EkAQS3gY/s3200/west_04_6516d80.png) 0 0 no-repeat;
  /*margin: 400px auto;*/
  position: absolute;
  top: 57%;
  left: 62%;
  animation: sszou 1s steps(8) infinite;
 }
 @keyframes sszou {
  to {
   background-position: -1680px 0;
  }
 }

<div class="wk"></div>
<div class="bj"></div>
<div class="ts"></div>
<div class="ss"></div>
<div class="main">
    <ul>
        <li></li>
        <li></li>
    </ul>
</div>