Ok so this is what happens:
1. Go to templates and select the group CSS and newly created template page “animate”.
2. It opens as a blank text box like normal and I paste my code into it.
3. Click “Update and Finished” or “Update” and I get “Status: 404 Page Not Found”!
Its version 2.7.0 but I have the same issue now with 2.7.1.