Enhance dark mode in travel itineraries

[Ankitha2130]

Is there an existing issue for this?

• [X] I have searched the existing issues

What happened?

1. Headings not visible on dark mode.
2. Itineraries not changing color on dark mode.

Record

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

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