[ sorry, my initial detailed text got deleted when I uploaded the image. Let me rewrite the description ]

Txs a lot to @brianteeman for this PR #46377 which introduced Dark Mode for TinyMCE.

Today, as I was editing in the back-end with TinyMCE, I noticed the following:

• links are blue
• but when you click on a link to select it, its background also becomes blue
• so blue on blue makes the text of the link unreadable :)

See the first link on the screnshot below.

Not a big issue but probably worth correcting though.

So I guess that when the background becomes blue, the text should become white (or some other combination of course).

Txs.