XOR color in stacked div ?

Hello!
I want to display a info box with follows the mouse position.
I have defined the background color transparent.
Sometimes the text is not identifiably because the subjacent element has the same color.
Do you know a method or property that the color change dynamically?
Perhaps that the color is XOR of the color of the subjacent element.

Thank you for tips
Erhie

Comments

[Erhie]

now I detected the attribute mixBlendMode and it works.
see