Qualcuno mi saprebbe dire per quel motivo quando carico questa pagina non mi prende il css (Text)mentre mentre se ci aggiungo come prima riga <div class='Text'></div> funziona tutto?

grazie

Codice PHP:
<div class='Text'></div>-----> SE TOLGO QUESTO NON VA
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Game._Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>Progetto</title>
    <style type="text/css">
        .Text
        {
            font: 10px;
            font-family: Verdana;
            color: #0000FF;
        }
        </style>

   
</head>
<body class="Text">
    <form id="form1" runat="server">
   
     
        <table class="Text">
            <tr>
                <td>
                    User:</td>
                <td class="Text">
                    <input runat="server" id="txtUser" type="text" /></td>
            </tr>
            <tr>
                <td>
                    Password</td>
                <td class="Text">
                    <input runat="server" id="txtPass" type="text" /></td>
            </tr>
        </table>
        <div>
        <asp:button class="Text" id="SampleButton" runat="server" text="Login" onclick="Button1_Click" />
        Per registrasi cliccare qui

        </div>
        <asp:GridView ID="GridView1" runat="server" class="Text">
        </asp:GridView>
  

    </form>
</body>
</html>