fix: content centering and z-index position on adaptation

[ihor-romaniuk]

Description

This pull request contains recommendations for fixing block indentation (make it decimal) and correct display of the header (z-index of the header) during adaptation.

Related Pull Requests

PR to the open-release/palm.master branch: #1095
PR to the master branch: #1094

Screenshots

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (open-release/quince.master@60e2119). Click here to learn what that means.

Additional details and impacted files

@@                      Coverage Diff                      @@
##             open-release/quince.master    #1093   +/-   ##
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  Coverage                              ?   86.97%           
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  Files                                 ?      124           
  Lines                                 ?     2265           
  Branches                              ?      624           
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  Hits                                  ?     1970           
  Misses                                ?      286           
  Partials                              ?        9           

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[mphilbrick211]

Hi @openedx/vanguards! This is ready for review / merge after the master is all set.

[openedx-webhooks]

@ihor-romaniuk 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.