Improve text color on hover button

[VitaliyShulik]

When an admin sets up dark color to the background color in the 'light' theme text color is not displayed

https://user-images.githubusercontent.com/36531102/168981355-5cf0027a-4703-4004-9725-2c9e89d54286.mp4

Maybe it solves this issue - https://stackoverflow.com/questions/11867545/change-text-color-based-on-brightness-of-the-covered-background-area

[Disti4ct]

5082