On Searched page, Search button background is missing and not aligned.

After fixing the issue.

Applied: https://git.drupalcode.org/project/material_base/-/merge_requests/8#note....
This resolves the mentioned issue.
Tested with the following versions:
Drupal 10.3
Theme 3.0.0.
Steps taken

1. Install theme.
2. Place search block and check button.

Ready to be moved to RTBC (Reviewed & Tested by the Community).