* {
            margin: 0;
            padding: 0
        }
        .box {
            width: 500px;
            height: 300px;
            border: 1px solid #ccc;
            margin: 0px auto;
            padding: 0px;
 
        }
        .images{
            width: 500px;
            height: 300px;
            position: relative;
        }
        .images img{
            width: 500px;
            height: 300px;
            vertical-align: top
        }
        ul {
            width: 1000%;
            position: absolute;
            list-style: none;
            left:0;
            top: 0;
        }
        .images li{
            float: left;
 
        }
 
        ol {
            position: absolute;
            height: 20px;
            right: 20px;
            bottom: 20px;
            text-align: center;
            padding: 5px;
        }
        ol li{
            display: inline-block;
            width: 20px;
            height: 20px;
            line-height: 20px;
            background-color: #fff;
            margin: 5px;
            cursor: pointer;
 
        }
        ol .current{
            background-color: red;
        }
        #arr{
            display: none;
        }
        #arr span{
            width: 40px;
            height: 40px;
            position: absolute;
            left: 5px;
            top: 50%;
            margin-top: -20px;
            background: #fff;
            cursor: pointer;
            line-height: 40px;
            text-align: center;
            font-weight: bold;
            font-family: '黑体';
            font-size: 30px;
            color: #000;
            opacity: 0.5;
            border: 1px solid #fff;
        }
        #arr #right {
            right: 5px;
            left: auto;
        }