fix: Let notifications background cover entire page width

[jperals]

Description

Related links, issue #, if available: n/a

How has this been tested?

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.20%. Comparing base (09a1b44) to head (60ae3bf).

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #2863    +/-   ##
========================================
  Coverage   96.20%   96.20%            
========================================
  Files         761      761            
  Lines       21436    21436            
  Branches     6939     7326   +387     
========================================
  Hits        20622    20622            
  Misses        806      806            
  Partials        8        8            

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