Rounded corners Textbox control

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ASP.NET

I want the <asp:Textbox>,<asp:Button> in my application with rounded corners, tried with AJAX Control Tool Kit but its does not affect either the button control or the textbox control has effect only in Panel. Is there any other way. I found that <asp:Panel> is also not affected by using AJAX RoundedCornerExtender. Is there any other way like using CSS without images, It should also be compatible with all type of browsers.

Thanks in advance