little ui improvement

src/main/webapp/app/layouts/main/main.component.html

 <div style="width: 100%">
-  <!-- TODO
+  <div class="container-fluid">
     <div *ngFor="let m of getActiveMessages()">
-     <div class="alert alert-warning">{{m.message}}</div>
+      <div class="alert alert-warning text-center">{{ m.message }}</div>
     </div>
-     -->
-  <div class="container-fluid">
     <!-- codeability bar -->
     <div class="row" id="top-space">
       <div><img src="/content/img/logo-top.png" alt="codeAbility" width="168px" /></div>
@@ -17,9 +15,6 @@
     </div>
 
     <div class="pagewrapper"></div>
-    <div *ngFor="let m of getActiveMessages()">
-      <div class="alert alert-warning">{{ m.message }}</div>
-    </div>
 
     <!-- Main content -->
     <router-outlet></router-outlet>