Color of alerts in Forms

Hello,
I would likt to change the color of the Alert box on the forms.
Now it is orange. I have found this topic: https://support.balbooa.com/forum/joomla-forms/9881-change-colour-of-form-field-alerts
But it doesn't work.
And when I use the inspector, I don't see the css code fpor these boxes.
Can you help me please?

Regards, Peter

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