fix footer placement (#1351)

Author: cctdaniel

governance/xc_admin/packages/xc_admin_frontend/components/layout/Layout.tsx

@@ -4,9 +4,9 @@ import Header from './Header'
 
 const Layout = ({ children }: { children: React.ReactNode }) => {
   return (
-    <div className="relative overflow-hidden">
+    <div className="flex flex-col min-h-screen relative overflow-hidden">
       <Header />
-      <main>{children}</main>
+      <main className="flex-grow">{children}</main>
       <Footer />
     </div>
   )