update flutter UI

lib/comment_suggest.dart

@@ -68,7 +68,7 @@ class _CommentSuggestPageState extends State<CommentSuggestPage> {
         body: new SingleChildScrollView(
           child: Center(
             child: Column(
-              mainAxisAlignment: MainAxisAlignment.start,
+              // mainAxisAlignment: MainAxisAlignment.start,
               children: <Widget>[
                 Container(
                   alignment: Alignment.topCenter,
@@ -119,14 +119,14 @@ class _CommentSuggestPageState extends State<CommentSuggestPage> {
                   ),
                 ),
                 Container(
+                  alignment: Alignment.bottomCenter,
                   decoration: BoxDecoration(
                       border:
                           Border.all(color: ALColors.Color323232, width: 1.5)),
-                  margin: EdgeInsets.only(left: 30, right: 30, top: 90),
-                  padding: EdgeInsets.all(0),
+                  margin: EdgeInsets.only(left: 30, right: 30, bottom: 30, top: 180),
+                  // padding: EdgeInsets.all(0),
                   constraints:
                       BoxConstraints(minWidth: ALDevice.width, minHeight: 45),
-                  alignment: Alignment.center,
                   child: FlatButton(
                     onPressed: confirmClick,
                     child: Text(