centering progress bar

Author: ritamtbsilva

shinyproxy/templates/app.html

@@ -19,8 +19,8 @@
       <div class="loading-txt">
         Launching <span th:text="${appTitle}"></span>...
       </div>
-      <div class="progress">
-        <div class="progress-bar progress-bar-striped active" role="progressbar"></div>
+      <div class="progress center-block"  style="width:400px;">
+        <div class="progress-bar progress-bar-striped active" role="progressbar" ></div>
       </div>
     </div>
     <style th:inline="text">