fix: select does not use theme token for bg

[RobChangCA]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
• Do your commits follow the Conventional Commits standard?
• Does your PR title also follow the Conventional Commits standard?
• If you have a breaking change, is it correctly reflected in your commit message? (e.g. feat!: breaking change)
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• [ ]
  
  align text in code preview button
  

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PR-Codex overview

This PR focuses on updating the styling of a div and a select-menu component to improve their appearance and responsiveness.

Detailed summary

• In page.tsx, changed className from hidden lg:flex to hidden lg:block.
• Updated background and text colors based on the showCode condition.
• In select-menu.tsx, changed background color from bg-bg-surface-default to bg-[white] for better visibility.

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