UI of Thank You Page updated

[probot-codes]

All Submissions:

• [x] Have you followed the guidelines stated in README.md file?
• [x] Have you checked to ensure there aren't any other open Pull Requests for the desired changed?

Type of change

Please delete options that are not relevant.

• [x] New feature (non-breaking change which adds functionality)

After these steps, you're ready to open a pull request.

a. Give a descriptive title to your PR.

b. Describe your changes.

c. Put `closes #XXXX` in your comment to auto-close the issue that your PR fixes (if such).