 2001;
            color: #ffffff;
            background-color: #4c4e5a;
            /*边缘的宽度*/
            border-width: 10px;
            /*圆角的大小 */
            border-radius: 10px;
            /*边框颜色*/
            border-color: #000 #000 #000 #000;
        }

        #preview
        {
            height: 100px;
            width: 100px;
            position: absolute;
            display: none;
            text-align: center; 
            font-weight: bold;
            left: 