Support Class to enable the sharing of consistent styles across multiple elements

[M-Adoo]

Purpose of this Pull Request

• Support Class to enable the sharing of consistent styles across multiple elements
• Refactor the scrollbar demo to utilize the Class functionality.

Checklist Before Merging

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• If this is linked to an issue, include the link in your description.
• If you've made changes to the code or documentation, make sure these are updated in the CHANGELOG.md file.
• If you've introduced any break changes, briefly describe them in the Breaking section of the CHANGELOG.md file.

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