Feat: Adding theme to Travel Service Pages

[Deepika14145]

Describe the feature

I see the dark mode is applied only to several page, Not to every page. I will add dark theme to the service page.

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• I agree to follow this project's Code of Conduct
• I'm a GSSOC'24 contributor
• I want to work on this issue

[github-actions]

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[github-actions]

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We're excited to see your contribution as part of GSSOC Extended Edition 2024 and Hacktoberfest! 🎉
Happy open-source contributing!

[github-actions]

Hello @Deepika14145! Your issue #1555 has been closed. Thank you for your contribution!