[US-5-1] [Donwload locators] Button [Cancel] have black text color on black background color.

[pulya-na-vullet]

test environment: google chrome 95.0.4638.54
site: mail.ru
steps:

1. Open site in brouwser google chrome
2. Open plugin jdn
3. Click button [identify]
4. when locators don't end loading press [Download] button
5. Open a Domwload warning functional menu

ER: user can see button [Cancel]
AR: user can't see button [Cancel]