fix: add Material to decoration

packages/pinball_ui/lib/src/dialog/pixelated_decoration.dart

@@ -20,22 +20,19 @@ class PixelatedDecoration extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     const radius = BorderRadius.all(Radius.circular(12));
-    const borderWidth = 5.0;
 
-    return DecoratedBox(
+    return Material(
+      borderRadius: radius,
+      child: Padding(
+        padding: const EdgeInsets.all(5),
+        child: DecoratedBox(
           decoration: BoxDecoration(
+            borderRadius: radius,
             image: DecorationImage(
               fit: BoxFit.fill,
               image: AssetImage(Assets.images.dialog.background.keyName),
             ),
-        borderRadius: radius,
-        border: Border.all(
-          color: Colors.white,
-          width: borderWidth,
           ),
-      ),
-      child: Padding(
-        padding: const EdgeInsets.all(borderWidth),
           child: ClipRRect(
             borderRadius: radius,
             child: Column(
@@ -53,6 +50,7 @@ class PixelatedDecoration extends StatelessWidget {
             ),
           ),
         ),
+      ),
     );
   }
 }