message: render <BorderBox> with (fixed) position: relative in <PointerBox>
diff: @@ -9,24 +9,19 @@ function PointerBox(props) {
  const {caret, children, ...boxProps} = props
  const caretProps = {bg, borderColor, borderWidth: border, location: caret}
  return (
  - <Position {...boxProps}>
  + <BorderBox {...boxProps} css={{position: 'relative'}}>
  {children}
  <Caret {...caretProps} />
  - </Position>
  + </BorderBox>
  )
  }
  PointerBox.propTypes = {
  - ...Position.propTypes,
  + ...BorderBox.propTypes,
  caret: Caret.propTypes.location
  }
  -PointerBox.defaultProps = {
  - ...BorderBox.defaultProps,
  - position: 'relative'
  -}
  -
  -// we can set this because it "extends" Position implicitly
  +// we can set this because it "extends" Box implicitly
  PointerBox.systemComponent = true
  export default PointerBox
  