feat: better styling for thumb/track radius

[kantakshay]

Fixes Issue

**My PR closes #467

👨‍💻 Changes proposed(What did you do ?)

• first of all, I changed the styles of the checkbox as per the new design.
• Added + and - buttons beside the input element
• styled them so they look good.
• Implemented function to the + and - buttons so they can add or subtract the values of input elements.
• for the function implementation I made changes in the input-range.ts and getElement.ts files

✔️ Check List (Check all the applicable boxes)

• My code follows the code style of this project.
• This PR does not contain plagiarized content.
• The title and description of the PR is clear and explains the approach.

Note to reviewers

📷 Screenshots

[Dun-sin]

you don't need to create a new PR, those changes can be added by amending the existing one

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Name	Status	Preview	Comments	Updated (UTC)
code-magic	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 18, 2023 6:54am

[Dun-sin]

you forgot the space between i talked about

[Dun-sin]

Doesn't look good on mobile

[Dun-sin]

still the same, use flex to properly style -> in case you don't know how to use it https://css-tricks.com/snippets/css/a-guide-to-flexbox/
use the space between to give a space between them, don't gap for situations like this

it should look like this:

[Dun-sin]

You did great, thanks for contributing, I hope you will stick around and continue to contribute to this project.

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[Dun-sin]

🎉 This PR is included in version 2.71.0 🎉

The release is available on GitHub release

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