Hi Maurizio,
Thank you for your interest in Syncfusion products.
Please create an DT incident for providing you the CSS files using the following link,
http://www.syncfusion.com/account/dashboardIn the interests of maintaining confidentiality, we have a policy of not sharing CSS files or otherwise proprietary customer specific information in the public Forum.
Please let me know if you have any concerns.
Regards,
Bharath