Ensure chatbot background is consistent with other components

[pngwn]

Description

Please include a concise summary, in clear English, of the changes in this pull request. If it closes an issue, please mention it here.

Closes: #(issue)

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Tests

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[gradio-pr-bot]

🪼 branch checks and previews

•	Name	Status	URL
	Spaces	ready!	Spaces preview
	Website	building...
	Storybook	ready!	Storybook preview
🦄	Changes	detecting...

---

Install Gradio from this PR

pip install https://gradio-builds.s3.amazonaws.com/9a04395e931cf3ee2eccb688c50c5128291d3440/gradio-4.36.1-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@9a04395e931cf3ee2eccb688c50c5128291d3440#subdirectory=client/python"

Install Gradio JS Client from this PR

npm install https://gradio-builds.s3.amazonaws.com/9a04395e931cf3ee2eccb688c50c5128291d3440/gradio-client-1.1.1.tgz

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
@gradio/chatbot	minor
gradio	minor

• Maintainers can select this checkbox to manually select packages to update.

With the following changelog entry.

Ensure chatbot background is consistent with other components

Maintainers or the PR author can modify the PR title to modify this entry.

Something isn't right?

• Maintainers can change the version label to modify the version bump.
• If the bot has failed to detect any changes, or if this pull request needs to update multiple packages to different versions or requires a more comprehensive changelog entry, maintainers can update the changelog file directly.

[freddyaboulton]

LGTM @pngwn !