sign up page scroll fix

frontend/pweb/lib/pages/signup/form/content.dart

@@ -12,6 +12,7 @@ class SignUpFormContent extends StatelessWidget {
   final bool autoValidateMode;
   final VoidCallback onSignUp;
   final VoidCallback onLogin;
+  final double maxWidth = 500;
 
   const SignUpFormContent({
     required this.formKey,
@@ -26,9 +27,8 @@ class SignUpFormContent extends StatelessWidget {
   Widget build(BuildContext context) => Align(
     alignment: Alignment.center,
     child: ConstrainedBox(
-      constraints: const BoxConstraints(maxWidth: 500, maxHeight: 700),
+      constraints: BoxConstraints(maxWidth: maxWidth),
       child: Card(
-        child: SingleChildScrollView(
         child: Column(
           children: [
             Row(
@@ -57,6 +57,5 @@ class SignUpFormContent extends StatelessWidget {
         ),
       ),
     ),
-    ),
   );
 }

frontend/pweb/lib/pages/with_footer.dart

@@ -7,16 +7,29 @@ class PageWithFooter extends StatelessWidget {
   final PreferredSizeWidget? appBar;
   final Widget child;
 
-  const PageWithFooter({super.key, required this.child, this.appBar});
+  const PageWithFooter({
+    super.key,
+    required this.child,
+    this.appBar,
+  });
 
   @override
   Widget build(BuildContext context) => Scaffold(
     appBar: appBar,
-    body: Column(
+    body: LayoutBuilder(
+        builder: (context, constraints) => SingleChildScrollView(
+          child: ConstrainedBox(
+            constraints: BoxConstraints(minHeight: constraints.maxHeight),
+            child: IntrinsicHeight(
+              child: Column(
                 children: [
                   Expanded(child: child),
                   FooterWidget(),
                 ],
               ),
+            ),
+          ),
+        ),
+      ),
   );
 }