fix callback dark mode background

[tomas-zijdemans-vipps]

Fixes #306

The code could be improved if you know the pre-generation class names.

A bonus of this code is that the background of error responses get a better contrast :)

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Latest commit: 80f6a99386abc525028abf34eb64b8893c7bc551

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

| Name | Type | | ---------------------- | ----- | | docusaurus-theme-redoc | Patch | | redocusaurus | Patch |

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Name	Status	Preview	Comments	Updated (UTC)
redocusaurus	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 20, 2023 9:33pm

[rohit-gohri]

Thank you for the fix! It's out in https://github.com/rohit-gohri/redocusaurus/releases/tag/v1.6.4