[Bug] Dropdown menu in the car billing system inconsistency in dark mode

[Rajitha-20050412]

Describe the bug

The dropdown menu in the fare calculator in the dark mode is visible in the light mode.

To Reproduce

Go to fare calculator in the navbar
click on the dark mode
observe the dropdown menu in the car model selection

Expected behavior

No response

Additional context

No response

[github-actions]

🙏 Thank you for opening this issue!

We appreciate your effort in contributing to this project. Our team will review the details shortly.

🔎 Meanwhile, please ensure that you have:

• Reviewed the README.md for project setup and guidelines.
• Gone through the CONTRIBUTING.md to follow contribution standards.
• Read the CODE_OF_CONDUCT.md to maintain a respectful community.

⚠️ Kindly note: Please do not create a Pull Request until this issue has been properly assigned to you. This helps us keep contributions well-organized. 🚀

Thanks again for your contribution! ✨

[Akashshelke07]

👋 Hi there!

Thank you for contributing! This issue involves fixing the dropdown menu in the fare calculator so that it displays correctly when dark mode is enabled.

✅ Please review README.md, CONTRIBUTING.md, and CODE_OF_CONDUCT.md before starting.
⚠️ Wait until this issue is assigned to you before submitting a Pull Request.

Once assigned, create a branch, adjust the dropdown styling for dark mode, and reference this issue in your PR (e.g., Fixes #<issue_number>).

🚀 Your help ensures a better user experience—thank you!