ISBAT Events block mobile styling issues

### Describe the bug:
Events Block styles broken

### To reproduce:

1. Add the events block to any page
2. See the page on mobile phone

### Expected behavior:
Events block should display events on mobile

### Screenshots:
https://imgur.com/PAzFnz1

### Isolating the problem:

- [x] This bug happens with no other plugins activated
- [x] This bug happens with a default WordPress theme active
- [x] This bug happens **without** the Gutenberg plugin active
- [x] I can reproduce this bug consistently using the steps above

### WordPress version:

6.4.3

### Gutenberg version:

Initally submitted on WP.org: https://wordpress.org/support/topic/mobile-layout-issue-w-events-block/