fix(frontend): コードエディタが正しく表示されない問題を修正

[kakkokari-gtyih]

What

コードエディタが正しく表示されない問題を修正（元issueのカスタムCSSを一部適用）

Why

Fix #12398

Additional info (optional)

とりあえず Firefox 116.0.2 (64 ビット) で動作することを確認

Checklist

• Read the contribution guide
• Test working in a local environment
• (If needed) Add story of storybook
• (If needed) Update CHANGELOG.md
• (If possible) Add tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ed6f866) 78.63% compared to head (aa87aa3) 78.78%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #12418      +/-   ##
===========================================
+ Coverage    78.63%   78.78%   +0.15%     
===========================================
  Files          176      178       +2     
  Lines        23358    23528     +170     
  Branches       496      496              
===========================================
+ Hits         18367    18537     +170     
  Misses        4991     4991              

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[github-actions]

このPRによるapi.jsonの差分

差分はこちら

Get diff files from Workflow Page

[syuilo]

🙏