feat(docs): add gray background color to docs

[Jocs]

close #xxx

Pull Request Checklist

• Related tickets or issues have been linked in the PR description (or missing issue).
• Naming convention is followed (do please check it especially when you created new plugins, commands and resources).
• Unit tests have been added for the changes (if applicable).
• Breaking changes have been documented (or no breaking changes introduced in this PR).

[github-actions]

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[github-actions]

Playwright test results

 4 passed

Details

 4 tests across 2 suites
 1 minute, 23 seconds
 8f40a37
 For more information, see full report

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 12 lines in your changes missing coverage. Please review.

Project coverage is 30.90%. Comparing base (d8b9271) to head (8f40a37).
Report is 3 commits behind head on dev.

Files with missing lines	Patch %	Lines
packages/ui/src/views/workbench/Workbench.tsx	0.00%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #3525      +/-   ##
==========================================
- Coverage   30.90%   30.90%   -0.01%     
==========================================
  Files        2161     2161              
  Lines      113497   113511      +14     
  Branches    24889    24892       +3     
==========================================
  Hits        35079    35079              
- Misses      78418    78432      +14     

Flag	Coverage Δ
	30.90% <0.00%> (-0.01%)	⬇️

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