If a level is smaller than the width or height that can be displayed on the screen, there will be a border on the screen window. Currently this border is the same black as the usual background of level. This makes it hard to distinguish the level area and the border outside. For this reason, we already added a red border in the clear physics mode. But one usually doesn't play in clear physics mode (for long). So we should add some kind of way to distinguish level and border even in normal game-play.
So I suggest displaying the border outside the level area in a dark gray, instead in black. As the background colors in levels are either black or tend to be blueish, this should solve the issue for now.
