A4 square paper is used to write modern poems. This paper can be in both traditional and modern formats. It doesn't matter.
The traditional format is to write from right to left, from right to left and from top to bottom, with the top flush and the bottom head not necessarily flush.
The signature can be long or short, depending on the remaining space, but it cannot be flush or higher at the top and flush or lower at the bottom. Stamp the last one or two lines.