Fixed some issue with the navbar .

[code-with-Priyanshu]

##🛠️ Fixes Issue

The More Dropdown option in the navbar is not properly visible at some particular dimension.  
 So I have fixed the issue to large extent. I have also checked the responsiveness of the website.

👨‍💻 Changes proposed

  Changed the navbar style at a particular dimension. But I have not altered any 
  design of the navbar.

✔️ 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

I have done the changes myself and the code does not contain any plagiarized content

##Screenshots

->Before

->After

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