后台输出HTML

 <style type="text/css">
        .style1
        {
            width: 120px;
        }
        .style3
        {
            width: 488px;
        }
        .green
        {
            height: 140px; bottom: 0; width: 100%; line-height: 160px;
        position: absolute; z-index: 100000; font-family: 'Courier New'; font-size: 60px;
        text-align: center;   font-weight: bold; padding-top: 10px; background-color:Green; color:#fff;
        }
        .red
        {
            height: 140px; bottom: 0; width: 100%; line-height: 160px;
        position: absolute; z-index: 100000; font-family: 'Courier New'; font-size: 30px;
        text-align: center;   font-weight: bold; padding-top: 10px; background-color:red; color:#fff;
        }
    </style>

 <div ID="divMsg" runat="server">
                </div>

this.divMsg.InnerHtml = "<div class=\"green\">PASS</div>";


this.divMsg.InnerHtml = "<div class=\"red\">FAIL</div>";