CSS not working but was working fine until Yesterday

Today when I opened up my Client’s wordpress website, Its CSS is not functioning anymore.
The site was working fine till yesterday.

We had 4 copies of Backups available. We tried Uploading them also but Still CSS is not working. I think this is a cPanel problem but I don’t know where to start from because all the Backups were working fine till Yesterday and site was Good enough.

All Plugins on website were customized and edited so we never updated any plugin.
Please Help!!

The page I need help with: [log in to see the link]

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