css3 网页图片轮播的实现

.lunbo{
  height: 640px;
   100%;
  background-position: -280px;
  margin-top: 103px;
  -webkit-animation: lunbo 5s infinite alternate;
}
@-webkit-keyframes lunbo{
  0%{
    background-image:url("../img/jinli_images/04_1515047442501.jpg");
  }
  100%{
    background-image:url("../img/jinli_images/02_1517536570441.jpg");
  }
}