You could use the WrapperCssClass
property of the RadInput to specify a CSS class. Then use this class in your CSS selector to get a higher specificity and to style only the inputs with the given class.
the Telerik team
If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to their blog feed