Minimum font size can break options UI

Describe the bug
In the browser settings, if we change the "Minimum font size" to 16 or more, the "Restore" line of "Backup and Restore" section disappears off the screen.

I have poor vision, so I need to keep the font settings quite large.

I'm using Brave Browser, but this might affect other browsers too, especially Chrome-based browsers.

To Reproduce
Steps to reproduce the behavior:

1. Under brave://settings/fonts, change "Minimum font size" to 18.
2. Go to Vimium options (chrome-extension://dbepggeogbaibhgnhhndojpepiihcmeb/pages/options.html)
3. Click on "Show Advanced Options" if the button is available.
4. Click on "Click to download backup" at the bottom.
5. Try to scroll down further to see how you can restore from the backup. The option for restoring is not visible anymore.
6. Change "Minimum font size" to 15.
7. The "Choose file" button for Restore is now visible.

Browser and Vimium version
chrome://version : 1.44.112 Chromium: 106.0.5249.119 (Official Build) (64-bit) OS: Linux
chrome://extensions : Version 1.67.2

Reproduce the issue from chrome-extension://dbepggeogbaibhgnhhndojpepiihcmeb/pages/options.html using a minimum font size of 18, then inspect the options page's Backup and Restore UI. Verify the restore controls remain reachable and visible at the reported font sizes, while preserving the existing behavior at smaller sizes.