code: def set_margin(self, top=40, bottom=30, left=50, right=10, buffer_size=8):
          
          self.set_integer("top", top)
          self.set_integer("bottom", bottom)
          self.set_integer("left", left)
          self.set_integer("right", right)
          self.set_integer("buffer", buffer_size)
docs: Set margin of the chart.
  
              Args:
                  top (int): size of top margin in pixels.
                  bottom (int): size of bottom margin in pixels.
                  left (int): size of left margin in pixels.
                  right (int): size of right margin in pixels.
                  buffer_size (int): buffer size in pixels between the chart and margins.