The UI has some issues on Mobile

[nimafanniasl]

Describe the bug
I installed the latest version of Drum machine on GNOME Mobile (postmarketOS) on the Pocophone F1, and there are some problems on mobile.

On mobile, I can't scroll to the next section and can only see the first two rows. When I try to scroll, a small scrollbar appears but it only moves the main container slightly ((:

To Reproduce
Steps to reproduce the behavior:

1. Install Drum machine on Mobile and Launch it
2. Try to scroll to the next rows

Expected behavior
The container should be easily scroll-able for mobile users, and a small scroll bar shouldn't appear when scrolling.

Screenshots
https://github.com/user-attachments/assets/f5453e88-01b9-4be0-8fae-37f09568ebd1

[sepehr-rs]

This seems like a common issue, unfortunately, as we saw the same in #35, too. I'll mark this as high priority, but I'm not sure what plans @Revisto might have for this.