Modified index and styles files for better UI of the website.

[utkarshsingx]

Description

Modified index and styles files for better UI of the website. Added description for image password strength and modified rounded borders for input buttons and modified the background image and modified box sizing. Fixed typo error of the title tag in index file.

Fixes #45

Type of change

Please delete options that are not relevant.

• [x] Bug fix
• [x] New feature

Checklist:

• [x] My code follows the style guidelines(Clean Code) of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have created a helpful and easy to understand README.md
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests/screenshots(if any) that prove my fix is effective or that my feature works

Screenshot of new UI-

[DevilsAutumn]

Good work!

[DevilsAutumn]

@utkarshsingx Never push directly to the main branch of forked repo, create a new branch -> push changes to that branch -> then create a PR from that branch.