Solution box in book class

I am writing a book, 95% completed, and I intend to change an environment as soon as it is over. I wrote the entire book with the exam class, because when I started I had no idea that it is very different from the book class. Now I want to return to the book class and for that I need the solutionbox environment present in the exam class, but I can’t find any solution that is similar to what the exam class provides. The other alternatives do not present the box, only the solution environment. Thanks for your help, below is a demonstration: