fix: update toggle button width

[alangsto]

COSMO-203

The Xpert toggle button was appearing with a larger width than intended in safari. No width was specified (either by percentage or pixel), so browsers likely calculated/inferred the width for the toggle element differently.

This change specifies a pixel width, so that the button appears the same across browsers.

Before:

After:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.36%. Comparing base (d42982c) to head (3e0f107).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #45   +/-   ##
=======================================
  Coverage   81.36%   81.36%           
=======================================
  Files          13       13           
  Lines         220      220           
  Branches       30       30           
=======================================
  Hits          179      179           
  Misses         39       39           
  Partials        2        2           

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