It’s a file casing.
Change your file name to http://www.rhevon.com/css/Flipclock.css
and this will work.
As I mentioned file names are case sensitive on Linux, that is why you had this working in local Windows environment. Your file name is ‘Flipclock.css’ not ‘FlipClock.css’.
Don’t forget to mark it as a valid answer, if it helped you.
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solved Countdown clock works properly offline but doesnt work online