Hello.

The fastest way of getting the original Corporate site CSS is this. You can back-up your current CSS code (just copy/paste it to some temporary txt file, or create another stylesheet in the Site Manager / Development / CSS stylesheets section) and import Corporate sample site via New site wizard. You can import it just as a temporary web site, which will be deleted soon. However, important thing is to select (check) Corporate site stylesheet in Step 4, in Global objects / Development / CSS stylesheets section. This will override your current Corporate site stylesheet. At this moment, you have both styles and you use it according to your needs.

Optionally, you can send us and e-mail to support@kentico.com and we will send it to you. Thank you.

Best Regards,
Radek Macalik