UI: remove ActionBar background style

[eungyeole]

What I did

ActionBar has a background style, but this is not necessary, which causes a problem of breaking the style as shown in the image below

• remove ActionBar Container background style

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Testing

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• [ ] stories
• [ ] unit tests
• [ ] integration tests
• [ ] end-to-end tests

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  Available labels

  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
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[cdedreuille]

I'll take a proper look at this one very soon.

[cdedreuille]

I think this background is necessary in some addons as this component is used in many places. I would be quite hesitant to remove it for now as it could have side effects in other places. That said, we are looking at improving this design as I don't believe having the Copy button on top is a pattern we should keep.

So if that's ok I'm going to close this one for now and fix it with our new design.

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