Change background-color textentry field in a form

Hello, In a survey I build in a form like the below screenshot: !

On the field Zipcode I added a validation on Postalcode. If a wrong code is given, a message appears. But I also want to have a different background-color. How can I set this background-color to a bit of red? Thanks in advance.

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Do you want to set it permanently red or become red only on wrong entry.

@Nico_Leussink ; jQuery("[id='QR~"+this.questionId+"~4'] ").css({"background-color":"red"});

@bansalpeeyush29 : I would like to have it red when wrong and default color when correct. Is such possible?

Default you can set as per @LaT while on error it seems difficult.

You can have look at below code https://www.oreilly.com/library/view/javascript-cookbook/9781449390211/ch14s04.html

Thank you all, this helped me a lot.

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