Hi Ana Cepeda,
Thank you for using our services.
Please, take a look at the following KB article explaining how to style RadControls for ASP.NET AJAX in Sitefinity: Controling appearance of RadControls for ASP.NET AJAX in Sitefinity
. You can download a trial version of the RadControls for ASP.NET AJAX
in order to get the default skins' CSS files.
the Telerik team
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