code: func NewBox() *Box {
  	b := &Box{
  		width:           15,
  		height:          10,
  		innerX:          -1, // Mark as uninitialized.
  		backgroundColor: Styles.PrimitiveBackgroundColor,
  		borderColor:     Styles.BorderColor,
  		titleColor:      Styles.TitleColor,
  		titleAlign:      AlignCenter,
  	}
  	b.focus = b
  	return b
  }
docs: // NewBox returns a Box without a border.