Unsupported block editor loading screen invisible text in dark mode

[hypest]

Describe the bug While the Unsupported Editor mode is loading, the screen informs the user to ensure they have the block editor enabled on their site, and also displays an error message on failure. But, on dark mode, the text copy is not visible.

To Reproduce Steps to reproduce the behavior: 0. On an Atomic site, enable the classic editor plugin and set is as default for all users (some instructions here)

1. On the mobile app and while in Dark mode
2. In a post with an unsupported block, click on the ? of the block and then "Open in the web editor" on the bottomsheet
3. Notice that there's no Please ensure the block editor is enabled on your site. If it is not enabled, it will not load. message visible
4. After some more seconds, notice that the error messages are not visible either

Expected behavior The text copy should be visible in Dark mode as well.

Screenshots

Phase	Light mode	Dark mode
Loading
Errored

Smartphone (please complete the following information):

• Device: Pixel 2XL
• OS: Android 11
• Version: tested on WPAndroid v19.5-rc-1

Additional context Probable happens on previous app versions too, but haven't tested yet.