I need a overlay grid that is either sizeable or fits the grid shown on the screenshot. It is for personal use only so there does not need to be any easy-to-use-interface.
I will use it as an overlay for a windowed programm on my windows PC and i want the single grid field to get a light red filling, when i click in the programm "below" a grid field. I also need a reset-button which will remove the color from all grid fields.
For further questions: Feel free to ask.