So I personally wouldn’t worry so much about the styling and the text, but rather about the fact that you shouldn’t use this e-mail tag in germany.
Keyword -> Double-Opt-In (and additionally the addresses are unencrypted on the server).
Or do you/they contact the users manually if they really want to be added to the list, then I didn’t say anything, but very complex.
The e-mail list certainly has its right to exist, but not in germany, only my opinion.