Fix tablet appearance of login screens

lib/ui/widgets/login_route_container.dart

@@ -0,0 +1,36 @@
+import 'package:comunic/models/config.dart';
+import 'package:comunic/ui/widgets/login_routes_theme.dart';
+import 'package:comunic/utils/ui_utils.dart';
+import 'package:flutter/material.dart';
+
+/// Login route container
+///
+/// Contains both theme and route centering
+///
+/// @author Pierre Hubert
+
+class LoginRouteContainer extends StatelessWidget {
+  final Widget child;
+
+  const LoginRouteContainer({Key key, @required this.child}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    if (!isTablet(context)) return LoginRoutesTheme(child: child);
+
+    return Container(
+      color: Config.get().splashBackgroundColor,
+      child: Padding(
+        padding: EdgeInsets.only(top: 10),
+        child: Center(
+          child: LoginRoutesTheme(
+            child: ConstrainedBox(
+              constraints: BoxConstraints(maxWidth: 370),
+              child: child,
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}