Fix html error and indentation

index.html

@@ -71,9 +71,9 @@
         </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>
+</form>
-      </div>
+</div>
-    </div>
+</div>
-  </body>
+</body>
 </html>