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To adjust the transparency of the snackbar in Flutter, you can use the backgroundColor property of the SnackBar widget and set the Color with the desired transparency level.

For example, you can set the backgroundColor property to Color.fromRGBO(0, 0, 0, 0.5) to have a black snackbar with 50% transparency.

Here is an example:

ScaffoldMessenger.of(context).showSnackBar(
  SnackBar(
    content: Text('This is a snackbar'),
    backgroundColor: Color.fromRGBO(0, 0, 0, 0.5),
  ),
);

In this example, the Color.fromRGBO takes four parameters: red, green, blue, and opacity. The first three parameters are set to 0 for a fully transparent color, while the opacity parameter is set to 0.5 for 50% transparency. You can adjust these values to get the desired transparency level.