I agree everything is good and most of the websites do this resizes for adapting to the user screen size and resolution. Yes, I have checked the mobile it's perfect on the mobile. So I'm suggesting to provide an option for the user to hide the activity window so that it will be up to the user whether to have or to hide it from the main screen.
Doesn't look like that will be an issue since it seems like a relatively simple update would add that functionality.
I'd also like to see the team add a bonus section to the activity tracker, so we can see what kind of multipliers and wins people are getting from these bonus games.