When i publish a game for browser i can set the "Fullscreen in browser" option to Crop, Scale outer, etc... it seems this not have much effect when exporting for CocoonJS, cause the game is shown always at the same way, it scales normally, but putting the game in the left side and a black bar to cover the empty space in the right.
How can i make it work like that but centering the game so i have black bars in both sides (left and right)?