Create an interactive Dice Roller app: Android Basics with Compose

[Sayukidz2]

URL of codelab
https://developer.android.com/codelabs/basic-android-kotlin-compose-build-a-dice-roller-app

In which task and step of the codelab can this issue be found?
Create a vertical layout
Describe the problem
the layout only aligns CenterHorizontally instead of both Horizontally and Vertically

Steps to reproduce?
add verticalArrangement = Arrangement.Center to the Column

Versions
Android Studio version:
API version of the emulator:

Additional information
Include screenshots if they would be useful in clarifying the problem.