revolution slider layer position responsiveness

Hi,
I made a fullwidth revolution slider with 3 slides on a fullwidth onepage site. Every slide contains a background image and 1-2 layers of text. On different size screens the background image is scaled (quite) properly but the position of the text layers not: they “move” relative to the image. So if I design and place a caption in a given position (relative to the image) on a desktop screen, it will be in a totally different place (relative to the image) on smaller screens.

What is the magic setting for a layer to hold it in place relative to the background image?

(I imported and build the slider from your onepage slider which has the same issues. (But in your case on your site it doesn’t mean a problem because of the different visual concept.)

Thanks,
John