<style type="text/css">
        body{
            margin:0; padding:0; 
        }
        div{
            border:3px solid;border-color:green;
            margin:0;padding:0; 
            height:400px;
            background-color:#00cccc;
        }
        ul{
            text-align:left;    
            width:100px;
            margin-left:30%;border:2px solid red; 
        }
        li{
            color:red; 
            list-style-image:url(li03.jpg); 
        }
        h1{
            border-style:dotted solid double; border-color:red;
            color:#666666;
            text-align:center;
            text-decoration:underline;
            border-width:4px;
            width:20%; background-color: #9966ff;
            margin-left: 40%;
            margin-right: 20%;
            margin-bottom:0;margin-top:0;

            /*如果要让一个盒子居中   这个盒子的左右外边距 zhi  auto*/
        }
        p{
            color: #595959;
            text-indent:2em;
         }
    </style>