ValidationSummary1.aspx font size:
<%@ Page clienttarget=downlevel %>
<%@ Register tagPrefix="aspx" tagName="footer" src="~/shared/footer.ascx" %>

<!doctype html public "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>ValidationSummary Sample</title>
<link rel="stylesheet" href="/shared/netdemos.css">

<script language="C#" runat="server">
void chgMode ( object src, EventArgs e ) {
   // Change display mode of the validator summary control "dispSumm"
   // when a new option is selected from the "dispMode" dropdownlist
   dispSumm.DisplayMode = ( ValidationSummaryDisplayMode ) dispMode.SelectedIndex;
   Validate ( );
}
</script>
</head>

<body>
<!-- #include virtual="~/shared/top.inc -->
<div class="header"><h2>ValidationSummary Sample</h2></div>

<!-- #include virtual="~/shared/viewsrc_top.inc" -->
<hr size=1 width=92%>

<div align="center">
<form runat="server">

<p>Select the validation summary display mode:

<asp:dropdownlist id="dispMode" autopostback
      onSelectedIndexChanged="chgMode" runat="server" >
   <asp:listitem>List</asp:listitem>
   <asp:listitem selected>Bulleted List</asp:listitem>
   <asp:listitem>Single Paragraph</asp:listitem>
</asp:dropdownlist>

</div>

<table width=75% cellpadding=5 align="center">
<tr>
   <td>
      <table bgcolor="gainsboro" cellpadding=5>
      <tr>
         <td colspan=3><b>Credit Card Information</b></td></tr>
      <tr>
         <td align=right>Card Type:</td>
         <td> <asp:radiobuttonlist id="RadioButtonList1" runat="server">
            <asp:listitem>MasterCard</asp:listitem>
            <asp:listitem>Visa</asp:listitem>
         </asp:radiobuttonlist></td>
         <td> <asp:requiredfieldvalidator id="RequiredFieldValidator1"
            controltovalidate="RadioButtonList1"
            errormessage="Card Type. "
            text="*" runat="server" /></td></tr>
      <tr>
         <td align=right>Card Number:</td>
         <td> <asp:textbox id="TextBox1" runat="server" /></td>
         <td> <asp:requiredfieldvalidator id="RequiredFieldValidator2"
            controltovalidate="TextBox1"
            errormessage="Card Number. "
            text="*" runat="server" /></td></tr>
      <tr>
         <td align=right>Expiration Date:</td>
         <td> <asp:dropdownlist id="DropDownList1" runat="server">
            <asp:listitem></asp:listitem>
            <asp:listitem>07/01</asp:listitem>
            <asp:listitem>08/01</asp:listitem>
            <asp:listitem>09/01</asp:listitem>
            <asp:listitem>10/01</asp:listitem>
            <asp:listitem>11/01</asp:listitem>
            <asp:listitem>12/01</asp:listitem>
            <asp:listitem>01/02</asp:listitem>
            <asp:listitem>02/02</asp:listitem>
            <asp:listitem>03/02</asp:listitem>
            <asp:listitem>04/02</asp:listitem>
            <asp:listitem>05/02</asp:listitem>
            <asp:listitem>06/02</asp:listitem>
            <asp:listitem>07/02</asp:listitem>
            <asp:listitem>08/02</asp:listitem>
            <asp:listitem>09/02</asp:listitem>
            <asp:listitem>10/02</asp:listitem>
            <asp:listitem>11/02</asp:listitem>
            <asp:listitem>12/02</asp:listitem>
         </asp:dropdownlist></td>
         <td> <asp:requiredfieldvalidator id="RequiredFieldValidator3"
            controltovalidate="DropDownList1"
            errormessage="Expiration Date. "
            text="*" runat="server" /></td></tr>
      <tr>
         <td colspan=3 align="center"> <asp:button text="Validate" runat="server" /></td></tr>
      </table></td>
   <td valign="top">
      <p><asp:validationsummary id="dispSumm" runat="server"
         headertext="You must enter a value in the following fields:"
         forecolor="blue" /></td></tr>
</table>

</form>
<hr size=1 width=92%>
<!-- #include virtual="~/shared/viewsrc.inc" -->

</body>
</html>