How to create this Expandable tip box in flutter

I’m working on a Flutter project and trying to create an expandable tip box similar to the one shown in the reference image below:

However, my current implementation is facing overflow issues, and the icon is not aligned properly, as shown in this result image:

Here’s the relevant code:

Container(
              padding: const EdgeInsets.all(10),
              decoration: ShapeDecoration(
                color: Colors.black.withOpacity(0.03999999910593033),
                shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(4)),
              ),
              child: const Row(
                mainAxisAlignment: MainAxisAlignment.start,
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Expanded(
                    child: Column(
                      mainAxisAlignment: MainAxisAlignment.start,
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Row(
                          crossAxisAlignment: CrossAxisAlignment.start,
                          children: [
                            SizedBox(
                              width: 280,
                              child: Text(
                                  'Download one of the files below. Open the file in Excel or a similar app, add user info, save, and upload.n',
                                  style: TextStyle(
                                    color: Colors.black,
                                  )),
                            ),
                            SizedBox(width: 5),
                            Icon(Icons.keyboard_arrow_down)
                          ],
                        ),
                        Text("Avoid common errors"),
                        BulletedText(
                            "You can upload up to 249 users per CSV file."),
                        BulletedText(
                            "Each user must have a unique username email address."),
                        BulletedText(
                            "Save as a CSV (comma delimited) file with 10 columns.​"),
                      ],
                    ),
                  ),
                  SizedBox(width: 10),
                  SizedBox(
                    width: 24,
                    height: 24,
                    child: Stack(children: []),
                  ),
                ],
              ),
            )

Could you provide guidance on how to resolve the overflow issues and properly align the icon within the tip box? I want to achieve a layout similar to the reference image. Thank you!