Twenty Twenty theme: Text in Verse Block in the block editor is too dark to see against a dark page background

[pauljacobson]

The color of text in a Verse Block is dark, and when used on a site with the Twenty Twenty theme, and where the site's background is set to a dark color, it's not possible to see the text in the block editor.

#### Steps to reproduce

1. Activated Twenty Twenty on a test site on WordPress.com
2. Changed the site background (main content and header/footer) to black in Colors in the Customizer
3. Created a new post in the block editor, and added a Verse Block
4. Added text to the Verse Block (pasted from an external source, no external/inline styling was added to the pasted text).

#### What I expected

Verse Block text should adapt to the dark background like text in other blocks, like a Paragraph Block.

#### What happened instead

Instead, the text in the Verse Block is almost impossible to see because it's dark text against a dark background.

#### Browser / OS version

Firefox Developer Edition v77b, macOS 10.15.5 (not sure what the user who reported this issue is using)

#### Screenshot / Video

​https://d.pr/i/dOYOBN/qWszm6Wi9y
​https://d.pr/i/luTBOl/5MIvbyOEBE
​https://d.pr/i/iq2G6M/7TtwenDVkH

#### Context / Source

User report on WordPress.com (3022847-zen)

[dolgelukkig]

Update form the user:

If it’s helpful, let them know I always use the latest version of Firefox on Windows 10.