removes additional bg-color for navbar on dark mode

[Murdock9803]

Fixes #355

Changes done:

• The white background color is removed for smaller screens (max-width : 768px)

Screenshots:

initial state of navbar (before changes) :

final state of navbar (after changes) :

Preview Link(s): https://github.com/Murdock9803/CircuitVerseDocs/blob/e888a3fd1fbbc67ca6588877081afff40531539a/docs/styles/theme.css

✅️ By submitting this PR, I have verified the following

• Checked to see if a similar PR has already been opened 🤔️
• Reviewed the contributing guidelines 🔍️
• Sample preview link added (add a link from the checks tab after checks complete)
• Tried Squashing the commits into one

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[Murdock9803]

This is my first open source contribution, any help and guidance on errors would be greatly appreciated.

[tachyons]

Thanks @Murdock9803

[Murdock9803]

Its my pleasure. looking forward for more.