helpers.each(leftBoxes.concat(rightBoxes), function(verticalBox) {
                if (verticalBox.getPadding) {
                    var boxPadding = verticalBox.getPadding();
                    maxVerticalTopPadding = Math.max(maxVerticalTopPadding, boxPadding.top);
                    maxVerticalBottomPadding = Math.max(maxVerticalBottomPadding, boxPadding.bottom);