Improve UX by hiding the vertical scrollbar inside the announcement (NoticeModal)
while keeping the content scrollable.
Changes
• NoticeModal.js
- Introduce `notice-content-scroll` class to the content wrapper.
- Remove inline custom scrollbar styling for cleaner code.
• index.css
- Add `.notice-content-scroll` to the global hidden-scrollbar rules, ensuring
scrollbars are hidden across browsers.
Result
Users can still scroll through long announcements, but no scrollbar is shown,
giving the modal a cleaner and more consistent appearance.
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