code: func NewButton(label string) *Button {
  	box := NewBox().SetBackgroundColor(Styles.ContrastBackgroundColor)
  	box.SetRect(0, 0, TaggedStringWidth(label)+4, 1)
  	return &Button{
  		Box:                      box,
  		label:                    label,
  		labelColor:               Styles.PrimaryTextColor,
  		labelColorActivated:      Styles.InverseTextColor,
  		backgroundColorActivated: Styles.PrimaryTextColor,
  	}
  }
docs: // NewButton returns a new input field.