How to change the Color of the speech bubbles on my iPhone?

My sister somehow did this so her outgoing text messages are now pink. Only she can't remember how she did it and she isn't that good with electronics so I don't think she like jail breaked her phone or thing.

Message appearence settings

Well there should be a special setting for that, I do it from settings-> appearence but I'm on android. I think the user above is right.

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