When i chose to apply an overlay, I want my background to be blacked out by 50%.
When i apply an overlay, I can only change position, transition and opacity.
My main page has white background with white text on it. When an overlay will come on top of it as a pop-up, i want the main page to be blacked-out by 50% transparency.
Why don't you allow us to choose custom background colour first and then set its opacity for overlays?