Fix html error and indentation

index.html

@@ -71,7 +71,7 @@
         </div>
         <form ng-submit="sendMessage()">
           <input type="text" ng-model="command"></input>
-              <input type="submit" class="btn btn-primary"></button>
+          <input type="submit" class="btn btn-primary"></index>
 </form>
 </div>
 </div>