well , if we are talking about the same login page on yahoo, here is my code.
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<!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 runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager runat="server" ID="ScriptmanagerTest">
</asp:ScriptManager>
<div style="padding: 20px; text-align: center">
<asp:Panel runat="server" ID="PanelTest" BackColor="#f5f7f7" Width="300px">
<asp:Login runat="server" ID="roundedLogIn">
</asp:Login>
</asp:Panel>
<cc1:RoundedCornersExtender ID="RoundedCornersExtender1" runat="server" TargetControlID="PanelTest"
BorderColor="black" Radius="4">
</cc1:RoundedCornersExtender>
</div>
</form>
</body>
</html>
Still in search of the far side.
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A code snippet may help you, but a reference to the doc will teach you something for later...Don't just try to solve somebody's problem with a snippet, teach him how to solve it.