lib/attachmentWidget.dart

@@ -7,12 +7,18 @@ class AttachmentWidget extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return Stack(
+    return Container(
+      color: Colors.black38,
+      child: Stack(
         // appBar: AppBar(title: Text('New Tab Content')),
-      children: [
-        Padding(
-          padding: EdgeInsets.fromLTRB(10, 20, 0, 0),
+        children: <Widget> [
+          
+          Container(
+            color: Colors.white,
+            child: Padding(
+              padding: EdgeInsets.fromLTRB(10, 20, 0, 10),
               child: Row(
+            
                 children: [
                   CloseButton(
                     onPressed: () => {  
@@ -30,6 +36,7 @@ class AttachmentWidget extends StatelessWidget {
                 ],
               ),
             ),
+          ),
           Center(
             child: Column(
               mainAxisAlignment: MainAxisAlignment.center,
@@ -43,6 +50,7 @@ class AttachmentWidget extends StatelessWidget {
             ),
           ),
         ],
+      ),
     );
   }
 }