[FIXED]-link and Layout

[rajpatelbot]

🛠️ Fixes Issue

Closes #779

👨‍💻 Changes proposed

Incorrect url in the button on error-404 page. Also changed some style of this page

✔️ Check List (Check all the applicable boxes)

• [x] My code follows the code style of this project.
• [x] This PR does not contain plagiarized content.
• [x] The title of my pull request is a short description of the requested changes.

📄 Note to reviewers

Hey @SauravMukherjee44, I proposed changes for only the incorrect URL but I also changed some styling of error-404 pages. Kindly check it and if you don't like, I will remove those styles after. For your reference I attached some images below-

📷 Screenshots

Before

After

• Thankyou...

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[rajpatelbot]

Hey @SauravMukherjee44, sorry for again ping. But can you please review this PR.