Enhance CSS for Accessibility, Performance, and Maintainability

[NirajDN]

PR Description

Updated comments for better organization and clarity. Enhanced styles for accessibility, animations, and responsiveness.

• Improved focus styles using :focus-visible for better keyboard accessibility.
• Added smooth transitions on interactive elements such as scrollbars and buttons.
• Refined animation behavior to prevent flickering and improve user experience.
• Enhanced mobile menu usability with improved focus and hover states.
• Strengthened support for high contrast and reduced motion preferences.
• Optimized print styles for better formatting on printed pages.
• Added consistent utility class overrides for easier layout adjustments.

Pull Request Checklist

Overview

• Put an x inside of the square brackets to check each item.
• I have read and understood the CONTRIBUTING.md guidelines
• My pull request has a descriptive title that accurately reflects the changes and the description has been filled in above.
• I've included only files relevant to the changes described in the PR title and description
• I've created a new branch in my forked repository for this contribution

Code Quality

• My code is relevant to ServiceNow developers
• My code snippets expand meaningfully on official ServiceNow documentation (if applicable)
• I've disclosed use of ES2021 features (if applicable)
• I've tested my code snippets in a ServiceNow environment (where possible)

Repository Structure Compliance

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  • Core ServiceNow APIs/
  • Server-Side Components/
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  • Integration/
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• I've used appropriate sub-categories within the top-level categories
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Documentation

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• My PR does not include XML exports of ServiceNow records
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• My PR does not include changes that fall outside the described scope

[am-shakeel]

Thank you for your contribution. However, it doesn’t comply with our contributing guidelines. As a reminder, the general requirements (as outlined in the CONTRIBUTING.md file) are the following: follow the folder+subfolder+snippetfolder guidelines and include a readme.md file explaining what the code snippet does. Review your contribution against the guidelines and make the necessary adjustments. Closing this for now. Once you make additional changes, feel free to re-open this Pull Request or create a new one.