helpers.each(topBoxes.concat(bottomBoxes), function(horizontalBox) {
                if (horizontalBox.getPadding) {
                    var boxPadding = horizontalBox.getPadding();
                    maxHorizontalLeftPadding = Math.max(maxHorizontalLeftPadding, boxPadding.left);
                    maxHorizontalRightPadding = Math.max(maxHorizontalRightPadding, boxPadding.right);