asp.net - How to style CalendarExtender today cell using css

Ajax CalendarExtender today style css
CalendarExtenderToDay.aspx

<%@ Page Language="C#" AutoEventWireup="true" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>

<!DOCTYPE html>
<script runat="server">
     
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Ajax CalendarExtender today style css - how to set today style in calender</title>
    <style type="text/css">
        .CalendarCSS 
        {
            background-color:DodgerBlue;
            color:Snow;
            }
        .ajax__calendar_header
        {
            background-color:DarkBlue;
            }
        .ajax__calendar_today
        {
            color:AliceBlue;
            font-weight:bold;
            text-decoration:underline;
            font-family:MS Sans Serif;
            }                        
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Navy; font-style:italic;">Ajax CalendarExtender Example: How To Style Current Date</h2>
        <hr width="580" align="left" color="CornFlowerBlue" />
        <asp:ScriptManager 
            ID="ScriptManager1"
            runat="server"
            >
        </asp:ScriptManager>
        <cc1:CalendarExtender 
            ID="CalendarExtendar1"
            runat="server"
            CssClass="CalendarCSS"
            TargetControlID="TextBox1"
            >
        </cc1:CalendarExtender>
        <br />
        <asp:Label 
            ID="Label1"
            runat="server"
            Font-Underline="true"
            ForeColor="DeepSkyBlue"
            Font-Bold="true"
            Font-Names="Comic Sans MS"
            Text="Calendar with today design"
            >
        </asp:Label>
        <asp:TextBox 
            ID="TextBox1"
            runat="server"
            Font-Bold="true"
            ForeColor="OrangeRed"
            >
        </asp:TextBox>
    </div>
    </form>
</body>
</html>
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