Fix: UX improvements in login page

[Sanjivani1224]

This PR improves the responsiveness and overall UI of the To-Do List project. It fixes layout inconsistencies, removes improper absolute positioning, and enhances mobile compatibility using CSS improvements for a smoother user experience across different screen sizes.

🎯 Type of PR
Bug fix
Feature enhancement
Documentation update
Security enhancement
Other (specify): UI/UX improvement

📸 Screenshots / Videos
Before:
Layout was breaking on smaller screens and buttons were misaligned.

✅ Checklist
I have performed a self-review of my code
I have read and followed the Contribution Guidelines
I have tested the changes thoroughly before submitting this pull request
I have provided relevant issue numbers
I have followed the code style guidelines of this project
I have ensured that my changes do not break any existing functionality
I have commented my code where necessary
I have read the resources for guidance
I have followed security best practices

📎 Additional Context

This PR focuses on improving usability and responsiveness of the To-Do List project, especially for smaller screen devices. It enhances user experience by ensuring proper layout structure and consistent UI behavior across devices.

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