fix

html/index.html

@@ -52,11 +52,11 @@
                                                 <input type="file" accept=".xlsx" class="file btn-primary" title="<span class='icon-download2'></span> Custom File Input">
                                             </div>
                                         </div>     -->
-                                        <input type="file" id="fileUpload" />
+                                        <input type="file" class="btn btn-success btn-lg" id="fileUpload" />
                                         
                                     </div>
                                     <div class="col-md-3">
-                                        <input type="button" id="upload" value="Upload" onclick="Upload()" />
+                                        <input type="button" id="upload" class="btn btn-success btn-lg" value="Upload" onclick="Upload()" />
                                     </div>
                                 </div>
                                 <br>