减少信息之间的间隔

lib/chat/ChatPageItem.dart

@@ -189,7 +189,7 @@ class _ChatPageItemState extends State<ChatPageItem>
 
     return Container(
       width: Screen.width,
-      margin: const EdgeInsets.symmetric(vertical: 10.0, horizontal: 8),
+      margin: const EdgeInsets.symmetric(vertical: 10.0, horizontal: 4),
       child: Column(
         children: <Widget>[
           showTime == null

lib/chat/group_chat_item.dart

@@ -189,7 +189,7 @@ class _GroupChatPageItemState extends State<GroupChatPageItem>
     return Container(
       width: Screen.width,
       color: Colors.white.withOpacity(0),
-      margin: const EdgeInsets.symmetric(vertical: 10.0, horizontal: 8),
+      margin: const EdgeInsets.symmetric(vertical: 10.0, horizontal: 4),
       child: Column(
         children: <Widget>[
           showTime == null