changes for header in /main.css

[maheshpatil132]

🛠️ Fixes Issue

👨‍💻 Changes proposed

✔️ Check List (Check all the applicable boxes)

• [ ] My code follows the code style of this project.
• [ ] This PR does not contain plagiarized content.
• [ ] The title of my pull request is a short description of the requested changes.

📄 Note to reviewers

📷 Screenshots

Before == ( hove effect of Join us button after clicking other menus Except for home menu )

After i edit 🤝 ==

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[maheshpatil132]

Please review it