Center content vertically in user and welcome pages

iridium_installer/ui/pages/additional_modules.py

@@ -46,7 +46,7 @@ class ModulesPage(Adw.Bin):
 
         # NVIDIA Drivers
         self.add_module_row(
-            "NVIDIA Proprietary Drivers",
+            "Proprietary NVIDIA Drivers",
             "Install proprietary drivers for NVIDIA graphics cards for better performance.",
             "nvidia_drivers",
         )

iridium_installer/ui/pages/user.py

@@ -15,6 +15,7 @@ class UserPage(Adw.Bin):
 
         box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL)
         box.set_spacing(24)
+        box.set_valign(Gtk.Align.CENTER)
         box.set_margin_top(24)
         box.set_margin_bottom(24)
         clamp.set_child(box)

iridium_installer/ui/pages/welcome.py

@@ -18,6 +18,7 @@ class WelcomePage(Adw.Bin):
         box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL)
         box.set_spacing(12)
         box.set_halign(Gtk.Align.CENTER)
+        box.set_valign(Gtk.Align.CENTER)
 
         lbl = Gtk.Label(label="Select your language:")
         lbl.add_css_class("heading")