feat: optimize banner style in dark theme

[kiner-tang]

[中文版模板 / Chinese template]

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Name	Status	Preview	Comments	Updated (UTC)
ant-design-web3	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 27, 2024 2:09am

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (df17585) to head (911234d).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #718   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          651       651           
  Lines        17773     17773           
  Branches      1113      1113           
=========================================
  Hits         17773     17773           

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