How to get stylesheets and external script files recognized

New to IntelliJ.  The IDE message is that it cannot resolve the directory.  For example if the stylesheet link is


I get the message that the IDE cannot resolve the directory.  If I do this it can, but it is wrong from the browser standpoint:


I don't know my way around IntelliJ yet so hints on setting it up and resolving this problem are appreciated.

Thank you,


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