optimize ui style

Signed-off-by: 21pages <pages21@163.com>

flutter/lib/desktop/pages/server_page.dart

@@ -33,14 +33,20 @@ class _DesktopServerPageState extends State<DesktopServerPage>
           ChangeNotifierProvider.value(value: gFFI.chatModel),
         ],
         child: Consumer<ServerModel>(
-            builder: (context, serverModel, child) => Material(
-                  child: Center(
-                    child: Column(
-                      mainAxisAlignment: MainAxisAlignment.start,
-                      children: [
-                        Expanded(child: ConnectionManager()),
-                        SizedBox.fromSize(size: Size(0, 15.0)),
-                      ],
+            builder: (context, serverModel, child) => Container(
+                  decoration: BoxDecoration(
+                      border:
+                          Border.all(color: MyTheme.color(context).border!)),
+                  child: Scaffold(
+                    backgroundColor: MyTheme.color(context).bg,
+                    body: Center(
+                      child: Column(
+                        mainAxisAlignment: MainAxisAlignment.start,
+                        children: [
+                          Expanded(child: ConnectionManager()),
+                          SizedBox.fromSize(size: Size(0, 15.0)),
+                        ],
+                      ),
                     ),
                   ),
                 )));