Overlapping Boxes with Negative Margins
In the Box tab within the right panel, enter a negative value for Margin to set a negative margin.
Select the box you want to overlap with another box.
Select the [Box] tab in the right panel. If the panel is closed, open the right panel first.
Enter a negative value in the [Margin] field under the [Layout] menu. Adjust the value for whichever direction (top, bottom, left, or right) you want the boxes to overlap.
negative margin overlap negative minus