WebForms (survey) in Adobe Campaign

Hi all

Had anybody created a survey webform with custom .css from Adobe Campaign? And... is it working?

We try (and try and try) to create it but we have always an error..., we upload the new .css on the server, we referenced in the style of our survey but, sometimes load the custom style but... sometimes not. The error is: Failed to load resource: the server responded with a status of 404 (Not Found)