code: func Clear(fg, bg Attribute) {
  	st := mkStyle(fg, bg)
  	w, h := screen.Size()
  	for row := 0; row < h; row++ {
  		for col := 0; col < w; col++ {
  			screen.SetContent(col, row, ' ', nil, st)
  		}
  	}
  }
docs: // Clear clears the screen with the given attributes.