Docs: CSS fixes and their propagations

[slackapi]

Automatically synchronizing changes to CSS / navbar / footer across sites

[salesforce-cla]

Thanks for the contribution! Unfortunately we can't verify the commit author(s): slackapi[bot] <5***@U***.n***.g***.com>. One possible solution is to add that email to your GitHub account. Alternatively you can change your commits to another email and force push the change. After getting your commits associated with your GitHub account, sign the Salesforce Inc. Contributor License Agreement and this Pull Request will be revalidated.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.93%. Comparing base (12b4498) to head (d118f7c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1192   +/-   ##
=======================================
  Coverage   90.93%   90.93%           
=======================================
  Files         222      222           
  Lines        7505     7505           
=======================================
  Hits         6825     6825           
  Misses        680      680           

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[lukegalbraithrussell]

thank you bot