CSS font-family property IDE (PHPStorm) warning

Uncheck this checkbox which will disable the check:

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Settings → Editor → Inspections → CSS → Probable bugs → Missing generic font name

It is recommended to add generic font families as a fallback while using a custom font.

Eg. font-family: 'DINPro-Medium', serif;

If the browser fails to load files for your custom font, it will use generic serif font.

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