"Enhance Styling and Layout of IT Income Tax Calculator Page

[SaiTejaswaniBikkasani]

Fixed issue: #1757

• Refactored internal CSS to external CSS for improved code organization and maintainability.
• Enhanced the visual styling of the Income Tax Calculator page:
• Added a background color and padding for a more appealing look.
• Styled the header, input fields, and buttons to ensure consistency and readability.
• Improved the layout and alignment of elements for better user experience.
• Incorporated hover effects on the submit button for interactive feedback.

Fixes: #1757

• New feature (non-breaking change which adds functionality)
• I have made this from my own
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings

ATTACH SCREEN-SHOTS / DEPLOYMENT LINK

After making the changes:

Without inputs:

By giving inputs:

[github-actions]

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