fix: remove raw CSS rendered as plain text at bottom of page

[alok-kumar0421]

Description

This PR fixes an issue where raw CSS code was being displayed as plain text at the bottom of the page.

Root Cause

CSS rules were accidentally placed after the closing </html> tag in frontend/index.html, causing the browser to render them as visible text instead of interpreting them as styles.

Changes Made

• Removed the unintended CSS code from frontend/index.html
• Ensured no CSS content is rendered as plain text
• Verified the footer and page layout render correctly

Testing

• Ran the application locally
• Confirmed that the raw CSS is no longer displayed at the bottom of the page
• Verified normal page rendering after the fix

Fixes #1339

[alok-kumar0421]

Implemented the fix for the raw CSS being rendered as plain text at the bottom of the page.

Root cause:
CSS code was accidentally placed after the closing tag in frontend/index.html.

Verified locally that the CSS is no longer displayed and the page renders correctly.

[alok-kumar0421]

@aryandas2911 please review pr