message: Hard-coded colour for now
  Helps to see the overlay when going back - currently preventing
  clicking of the colour until the overlay disappears
diff: @@ -36,7 +36,7 @@ export default ({stateNavigator}) => (
  top: 0,
  bottom: 0,
  }}>
  - {getOverlay(measurements, stateNavigator.stateContext.data.color)}
  + {getOverlay(measurements, 'green')}
  <View
  style={{
  flex: 1,
  