CSS3实现简单轮播图

<div id="container">
        <ul class="pic">
            <li><a href="javascript:;"><img src="images/DSC01627.jpg" alt="pic1">a>li>
            <li><a href="javascript:;"><img src="images/DSC01628.jpg" alt="pic2">a>li>
            <li><a href="javascript:;"><img src="images/DSC02637.jpg" alt="pic3">a>li>
            <li><a href="javascript:;"><img src="images/DSC01627.jpg" alt="pic1">a>li>
        ul>
        
    div>

　　　　　*{ 
             margin: 0;
             padding: 0; 
             text-decoration: none;
         }
        ul{
            list-style: none;
        }
        
        #container{
            position: relative;
            width: 400px;
            height: 200px;
            overflow: hidden;/*隐藏溢出的图片*/
        }
        .pic{
            width:1600px;/*4张图的宽度*/
            position: absolute;/*基于父容器进行定位*/
            left:0;
            animation-name: focusmap;
            animation-duration: 12s;
            animation-iteration-count: infinite;//动画调用可以简写

        }
         @keyframes focusmap {
            0%,30%{
                left: 0;
            }
            35%,65%{
                left: -400px;
            }
            70%,99%{
                left: -800px;
            }
            100%{
                left: -1200px;
            }
           
        }
        .pic li{
            float: left;
            background: #5dd94e;
        }

        .pic li img {
            width: 400px;
            height: 200px;
        }