Scrolling bar display issue: multiple scrolling bars when content is too long

[BetterAndBetterII]

Please provide us with the following information:

This issue is for a: (mark with an x)

- [x] bug report -> please search issues before submitting
- [ ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

Minimal steps to reproduce

Query a series of questions and make the conversation long enough.

Any log messages given by the failure

No log messages

Expected/desired behavior

Hide the right scrolling bar

OS and Version?

Windows 11.

azd version?

latest

Versions

2024-9-26

Mention any other details that might be useful

I think maybe the chatMessageStream and chatInput component cause the issue.

chatInput's sticky style expanded the height of chatMessageStream, so the outside scrolling bar appears.

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