diff --git a/web/viewer.html b/web/viewer.html
index 21b45aa9c..493549e91 100644
--- a/web/viewer.html
+++ b/web/viewer.html
@@ -33,7 +33,7 @@
         <script type="text/javascript" src="viewer.js"></script>
 
     </head>
-	
+
   <body>
     <div id="controls">
       <button id="previous" onclick="PDFView.page--;" oncontextmenu="return false;">
@@ -122,8 +122,8 @@
 
     <div id="sidebar" class="released">
       <div id="sidebarBox">
-	    <div id="pinIcon" class="released" onClick="PDFView.pinSidebar()"></div>
-	    <div id="sidebarScrollView">
+        <div id="pinIcon" class="released" onClick="PDFView.pinSidebar()"></div>
+        <div id="sidebarScrollView">
           <div id="sidebarView"></div>
         </div>
         <div id="outlineScrollView" hidden='true'>
@@ -137,7 +137,7 @@
             <img src="images/nav-outline.svg" align="top" height="16" alt="Document Outline" />
           </button>
         </div>
-     </div>
+      </div>
     </div>
 
     <div id="loading">Loading... 0%</div>
