code: func (b *Box) SetNicePlacement(container *Box) {
  	b.frame.X = container.inner.X
  	b.frame.Y = container.inner.Y
  	leftoverwidth := container.inner.W - b.frame.W
  	leftoverheight := container.inner.H - b.frame.H
  	if leftoverwidth > b.frame.W {
  		b.frame.X += leftoverwidth / 3
  	}
  	if leftoverheight > b.frame.H {
  		b.frame.Y += leftoverheight / 3
  	}
  }
docs: // Place a Box so that it either fills the given
  // container, or is placed 1/3 from the upper left edge,
  // depending on how much space is left.