refactor: address name conventions in css

[Hemanthghs]

          Here are some initial comments

• Don't include all styles in global.css. Only add CSS classes if they are used in multiple routes. otherwise, move them to the respective route's CSS.
• Maintain consistency in CSS class names. Choose either camelCase or kebab-case and stick with it throughout the project.
• Use descriptive and meaningful names for CSS classes. Avoid generic names like Feegrant1, Feegrant2, Header1 etc.
• Stick to one naming convention for asset filenames. Choose either camelCase or kebab-case.

Originally posted by @aleem1314 in #805 (comment)