Hint: To complete this challenge, you will have to think carefully about how to use Stack Views effectively. For example, try using 5 different horizontal Stack Views for the buttons and then put all the horizontal Stack Views into a single vertical Stack View.

Also, inspect your Stack View's properties. Check how much space the Stack View is giving its children. Is it distributing them equally or otherwise? 

You can find the completed project under the course resources: https://www.appbrewery.co/p/ios-course-resources/

If you've got some niggling bugs or there is something wrong with your code that you can't figure out, compare your code against the finished version of the app.

Simply clone the project from Github using Source Control → Clone inside Xcode. If you need a refresher on cloning repos, have a look at this lesson from the Dicee module: https://www.udemy.com/ios-13-app-development-bootcamp/learn/lecture/16251580