Optimal size/dimensions of background image
What are the optimal size-dimensions if I want to create a custom background image and have some control over what it will look like? I am talking about that first large image that is seen in the background with the title of the course written over it. As it is now, whatever image I select never looks quite the way I want it because Rise just sort of zooms in wherever, and in many cases degrades the image quality severely when it has to zoom in really far. What are the optimal size dimensions?