Flutterで一時停止みたいなアイコン

            Stack(
              alignment: AlignmentDirectional.center,
              children: [
                Container(
                  width: 18,
                  height: 18,
                  decoration: const BoxDecoration(
                    shape: BoxShape.circle,
                    color: Colors.white,
                  ),
                ),
                const Icon(
                  Icons.remove_circle,
                  size: 22,
                  color: Colors.red,
                ),
              ],
            ),