the-honkers-railway-launcher/assets/ui/first_run/voice_packages.blp

using Gtk 4.0;
using Adw 1;

Gtk.Box page {
    orientation: vertical;
    hexpand: true;

    Adw.PreferencesPage {
        Adw.PreferencesGroup {
            Gtk.Label {
                label: "Select voice packages";
                margin-top: 16;

                styles ["title-1"]
            }
        }

        Adw.PreferencesGroup voice_packages_group {
            vexpand: true;
            valign: center;
        }

        Adw.PreferencesGroup {
            vexpand: true;
            valign: center;

            Gtk.Box {
                orientation: horizontal;
                spacing: 8;
                halign: center;

                Gtk.Button continue_button {
                    label: "Continue";

                    styles ["suggested-action"]
                }

                Gtk.Button exit_button {
                    label: "Exit";
                }
            }
        }
    }
}