How to set width of countrypicker when using browser

[dancb10]

Hello,
I'm using the country picker as follows:
GestureDetector( child: Icon(Icons.edit), onTap: () { showCountryPicker( context: context, onSelect: (Country country) { setState(() { currentCountry = country.displayNameNoCountryCode; }); }, ); }, )

When the country picker is shown, the width cannot be set so it takes the whole monitor screen size

[dancb10]

How can we specify a width to the country picker?