This does not exist: https://cdn.datatables.net/fixedheader/3.0.0/css/dataTables.fixedHeader.min.css
Nor should it. The file name scheme was updated for FixedHeader 3. The index page for that release lists all the files.
The one you are looking for is probably: https://cdn.datatables.net/fixedheader/3.0.0/css/fixedHeader.dataTables.min.css .
Ah ok. I found the link I posted somewhere in the documentation. But I can't seem to find it again...
If you do, let me know and I'll fix it :-)
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