update collapsible menu css

[ashik-75]

✅ UI

• Identify and resolve any new warnings in the console
• Identify and resolve any new errors in the console
• If there are modifications to configurations such as vite.config.ts, tsconfig.json etc., ensure to include a description

⬜ Automation Scripts

• Identify and resolve any new warnings in the console
• Identify and resolve any new errors in the console
• If there are modifications to configurations such as vite.config.ts, tsconfig.json etc., ensure to include a description

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