Changing Messages Homes Screen Color on S7?

[AC Question]

I pulled my phone out of my pocket the other day and my message screen where it lists all the different messages I have receive from different people changed from white with black writing to black with white writing and I can barely read it now. I have tried searching this with absolutely no help. Some please, this is stupid.

 

[hallux]

Welcome
What app are you using? Is it the Samsung messaging app or the Google one?