fix

html/index.html

@@ -57,7 +57,7 @@
                                         
                                     </div>
                                     <div class="col-md-3">
-                                        <input type="button" id="upload" class="btn btn-success btn-lg" value="Загрузить" onclick="Upload()" />
+                                        <input type="button" id="upload" class="file btn-primary" value="Загрузить" onclick="Upload()" />
                                     </div>
                                 </div>
                                 <br>