DetailsViewAutoGenerateDeleteButton.aspx font size:
<html>
<title>DetailsView AutoGenerateDeleteButton Example</title>
<link rel="stylesheet" href="/shared/netdemos.css">
</head>

<body>
<!-- #include virtual="~/shared/top.inc" -->
<div class="header"><h2>DetailsView <span class="hilite">AutoGenerateDeleteButton</span> Example</h2></div>
<hr size=1 width=92%>

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

   <asp:detailsview id="guestDetails" runat="server"
      width=70% cellpadding=5
      datasourceid="guests"
      datakeynames="GuestId"
      autogeneratedeletebutton
      allowpaging>

      <rowstyle
         backcolor="ghostwhite"
         verticalalign="top" />
      <commandrowstyle font-bold
         horizontalalign="center" />
      <fieldheaderstyle
         backcolor="lightsteelblue"
         horizontalalign="right" />

      <headertemplate>
         <center>
            <p id="msg">To remove this entry, press Delete</p>
         </center>
      </headertemplate>

   </asp:detailsview>

   <asp:sqldatasource id="guests" runat="server"
      selectcommand="SELECT * FROM aspx_guests"
      deletecommand="DELETE FROM aspx_guests WHERE GuestId=@GuestId"
      connectionstring="<%$ ConnectionStrings:aspnet %>" />

</div>
</form>

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

</body>
</html>