CSS loading as empty file in Custom Theme

This looks like an issue of “File Permission” to me. Please check the file permissions on the involved folders and files.

You should find an option to change permission on the top bar or by right-clicking in cpanel. On the other hand, you can also right-click on a folder or a file and change its permission via Filezilla.

The ideal value is 755 or 750 for directories and 644 or 640 for files.
Read more here the codex page

Hope this helps.
Regards

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