[Ghost Admin] "What's New?" modal looks off in dark mode

[SteffoSpieler]

Issue Summary

The footer of the "What's new?" modal has a white background, which results in not being able to read the text of the "Turn on notifications" button.

Steps to Reproduce

1. Open Ghost Admin.
2. Enable dark mode.
3. Open the "What’s new?" modal through the context menu on your profile picture.
4. See the modal.

Ghost Version

5.105.0

Node.js Version

(Can't see that with docker)

How did you install Ghost?

Using a docker container on a debian 12 server.

Database type

MySQL 8

Browser & OS version

Firefox 133.0.3 (64-Bit) on Windows 11 Pro

Relevant log / error output

No response

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