SizedBox(
  width: 50,  // constrain the parent width so the child overflows and scrolling takes effect
  child: TickerText(
    // default values
    controller: tickerTextController, // this is optional
    scrollDirection: Axis.horizontal,
    speed: 20,
    startPauseDuration: const Duration(seconds: 10),
    endPauseDuration: const Duration(seconds: 10),
    returnDuration: const Duration(milliseconds: 800),
    primaryCurve: Curves.linear,
    returnCurve: Curves.easeOut,
    child: Text("Very long sentence..."),
  ),
);