jquery制作漂亮的弹出层提示消息特效

            $(‘#go’).fadeToggle(nr);
        }
        //@ sourceURL=pen.js
    </script>

css代码：

  body, html
        {
            height: 100%;
            font-size: 20px;
            font-family: Source Sans Pro;
        }
        .b, .bb
        {
            position: absolute;
            width: 100%;
            height: 100%;
            background: url(“kje4L5j.jpg”);
            background-attachment: fixed;
            background-size: cover;
            background-position: center;
        }
        .bb
        {
            background: url(“bDBs0et.jpg”);
            background-attachment: fixed;
            background-size: cover;
            background-position: center;
            display: none;
        }
        #go
        {
            position: absolute;
            top: 30px;
            left: 50%;
            transform: translate(-50%, 0%);
            color: white;
            border: 0;
            background: #71c341;
            width: 100px;
            height: 30px;