Buttons shape modified

[shivamshahi07]

Related to #132

Describe the changes you've made

I have added the border-radius property to the "RETAKE TEST", "NEW TEST" and the "BACK TO HOMEPAGE" buttons. i made the style of the border-radius identically like the other buttons so the buttons mentioned above will fit in quite nicely with the overall theme of the app .

Type of change

What sort of change have you made:

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Code style update (formatting, local variables)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?

This change was tested by running the app on a live server and comparing the changes with their previous state.

Checklist:

• [x] My code follows the guidelines of this project.
• [x] I have performed a self-review of my own code.
• [x] I have commented my code, particularly wherever it was hard to understand.
• [x] I have made corresponding changes to the documentation.

Screenshots (Images)

Before the changes	After the Changes

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