Fix/footer bug for mobile view

[khanparaYash]

What has changed?

This PR fixes the footer alignment issue on mobile view by properly centering the footer content.

The following changes were made:

• Added CSS rules to center-align footer elements on mobile screens.
• Replaced incorrect className attribute with class in HTML to ensure proper rendering.

This PR Resolves #(issue_number)

Type of change

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• Documentation update (if none of the other choices apply).

How Has This Been Tested?

• Ran npm run build successfully without errors.
• Ran npm run serve and verified the footer alignment on mobile view.
• Confirmed that the footer content is now properly centered and responsive.

(Screenshots attached showing before and after changes.)

Checklist:

• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.

-Before fix (misaligned footer)

After fix (centered footer on mobile)

[github-actions]

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