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How to find out the exact CSS configuration used by Rails for validation error messages
Open your Rails application
In a Web Browser, specially Google Chrome, open your Ruby on Rails application.
Trigger a validation error
Make sure you navigate to a page where you can trigger a validation error or view an existing validation error message.
Inspect the error message
Mouse your mouse to the error validation message or the element containing the message and right-click on it.
Check the CSS color
In the Styles tab, check the configuration.
Done
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