BUG: Fixes in Dark mode

[umar-9540]

Is there an existing issue for this?

• [X] I have searched the existing issues

What happened?

In dark mode some headings and lines are not appearing properly may be because of CSS properties are not right. Can you please assign this to me under HACKTOBERFEST label.

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• [ ] I'm a GSSOC'24 contributor
• [X] I want to work on this issue

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