Highlight a text with white background

Hi,

I try to highlight a text in adobe acrobat to make it more visible and readable because there is a picture behind it.

But when I choose the Highlight tool and set it to white noting happens. If I change the color to something else like pink, the highlight appears. I also checked the opacity, it works for other colors exept the white. 

Is it even possible to highlight with white and if so, how could I make it?

Thanks!