improved the NavBar's text color

[himanishu-2512]

Title and Issue number

Updated the NavBar text color.#123

Close #<issue_no>

Checklist:

• I have mentioned the issue number in my Pull Request.
• I have commented my code, particularly in hard-to-understand areas
• [] I have created a helpful and easy to understand README.md

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[himanishu-2512]

Please review it @pranjay-poddar .