diff --git a/public/views/hackmd/body.ejs b/public/views/hackmd/body.ejs
index 90c5d81..ad1e748 100644
--- a/public/views/hackmd/body.ejs
+++ b/public/views/hackmd/body.ejs
@@ -6,10 +6,10 @@
         <div class="ui-infobar container-fluid unselectable hidden-print">
             <small>
                 <span>
-                	<span class="ui-lastchangeuser" style="display: none;">&thinsp;<i class="ui-user-icon small" data-toggle="tooltip" data-placement="right"></i></span>
-                	<span class="ui-no-lastchangeuser">&thinsp;<i class="fa fa-clock-o fa-fw" style="width: 18px;"></i></span>
-                	&nbsp;<span class="text-uppercase ui-status-lastchange"></span>
-                	<span class="ui-lastchange text-uppercase"></span>
+                    <span class="ui-lastchangeuser" style="display: none;">&thinsp;<i class="ui-user-icon small" data-toggle="tooltip" data-placement="right"></i></span>
+                    <span class="ui-no-lastchangeuser">&thinsp;<i class="fa fa-clock-o fa-fw" style="width: 18px;"></i></span>
+                    &nbsp;<span class="text-uppercase ui-status-lastchange"></span>
+                    <span class="ui-lastchange text-uppercase"></span>
                 </span>
                 <span class="ui-permission dropdown pull-right">
                     <a id="permissionLabel" class="ui-permission-label text-uppercase" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">
diff --git a/public/views/hackmd/header.ejs b/public/views/hackmd/header.ejs
index 24282b0..87d2b06 100644
--- a/public/views/hackmd/header.ejs
+++ b/public/views/hackmd/header.ejs
@@ -1,7 +1,7 @@
 <nav class="navbar navbar-default navbar-fixed-top unselectable hidden-print">
     <!-- Brand and toggle get grouped for better mobile display -->
     <div class="navbar-header">
-		<div class="pull-right" style="margin-top: 17px; color: #777;">
+        <div class="pull-right" style="margin-top: 17px; color: #777;">
             <div class="visible-xs">&nbsp;</div>
             <div class="visible-sm">&nbsp;</div>
             <div class="visible-md">&nbsp;</div>
diff --git a/public/views/pretty.ejs b/public/views/pretty.ejs
index 3409a0f..80d2505 100644
--- a/public/views/pretty.ejs
+++ b/public/views/pretty.ejs
@@ -16,18 +16,18 @@
     <% } %>
     <title><%= title %></title>
     <link rel="icon" type="image/png" href="<%- url %>/favicon.png">
-	<link rel="apple-touch-icon" href="<%- url %>/apple-touch-icon.png">
-	<% if(useCDN) { %>
+  <link rel="apple-touch-icon" href="<%- url %>/apple-touch-icon.png">
+  <% if(useCDN) { %>
     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha256-916EbMg70RQy9LHiGkXzG8hSg9EdNy97GazNG/aiY1w=" crossorigin="anonymous" />
     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" integrity="sha256-eZrrJcwDc/3uDhsdt61sL2oOBY362qM3lon1gyExkL0=" crossorigin="anonymous" />
     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/ionicons/2.0.1/css/ionicons.min.css" integrity="sha256-3iu9jgsy9TpTwXKb7bNQzqWekRX7pPK+2OLj3R922fo=" crossorigin="anonymous" />
     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/octicons/3.5.0/octicons.min.css" integrity="sha256-QiWfLIsCT02Sdwkogf6YMiQlj4NE84MKkzEMkZnMGdg=" crossorigin="anonymous" />
     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/emojify.js/1.1.0/css/basic/emojify.min.css" integrity="sha256-UOrvMOsSDSrW6szVLe8ZDZezBxh5IoIfgTwdNDgTjiU=" crossorigin="anonymous" />
     <%- include build/pretty-header %>
-	<% } else { %>
+  <% } else { %>
     <link rel="stylesheet" href='<%- url %>/build/emojify.js/dist/css/basic/emojify.min.css'>
     <%- include build/pretty-pack-header %>
-	<% } %>
+  <% } %>
     <%- include shared/polyfill %>
 </head>
 
@@ -38,7 +38,7 @@
                 <% if(lastchangeuserprofile) { %>
                     <span class="ui-lastchangeuser">&thinsp;<i class="ui-user-icon small" style="background-image: url(<%- lastchangeuserprofile.photo %>);" data-toggle="tooltip" data-placement="right" title="<%- lastchangeuserprofile.name %>"></i></span>
                 <% } else { %>
-                	<span class="ui-no-lastchangeuser">&thinsp;<i class="fa fa-clock-o fa-fw" style="width: 18px;"></i></span>
+                  <span class="ui-no-lastchangeuser">&thinsp;<i class="fa fa-clock-o fa-fw" style="width: 18px;"></i></span>
                 <% } %>
                 &nbsp;<span class="text-uppercase ui-status-lastchange"></span>
                 <span class="ui-lastchange text-uppercase" data-createtime="<%- createtime %>" data-updatetime="<%- updatetime %>"></span>
diff --git a/public/views/shared/polyfill.ejs b/public/views/shared/polyfill.ejs
index 5c88564..82b2f02 100644
--- a/public/views/shared/polyfill.ejs
+++ b/public/views/shared/polyfill.ejs
@@ -1,7 +1,7 @@
 <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
 <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
 <!--[if lt IE 9]>
-	<script src="https://cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.3/html5shiv.min.js" integrity="sha256-3Jy/GbSLrg0o9y5Z5n1uw0qxZECH7C6OQpVBgNFYa0g=" crossorigin="anonymous"></script>
-	<script src="https://cdnjs.cloudflare.com/ajax/libs/respond.js/1.4.2/respond.min.js" integrity="sha256-g6iAfvZp+nDQ2TdTR/VVKJf3bGro4ub5fvWSWVRi2NE=" crossorigin="anonymous"></script>
-	<script src="https://cdnjs.cloudflare.com/ajax/libs/es5-shim/4.5.9/es5-shim.min.js" integrity="sha256-8E4Is26QH0bD52WoQpcB+R/tcWQtpzlCojrybUd7Mxo=" crossorigin="anonymous"></script>
-<![endif]-->
\ No newline at end of file
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.3/html5shiv.min.js" integrity="sha256-3Jy/GbSLrg0o9y5Z5n1uw0qxZECH7C6OQpVBgNFYa0g=" crossorigin="anonymous"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/respond.js/1.4.2/respond.min.js" integrity="sha256-g6iAfvZp+nDQ2TdTR/VVKJf3bGro4ub5fvWSWVRi2NE=" crossorigin="anonymous"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/es5-shim/4.5.9/es5-shim.min.js" integrity="sha256-8E4Is26QH0bD52WoQpcB+R/tcWQtpzlCojrybUd7Mxo=" crossorigin="anonymous"></script>
+<![endif]-->
diff --git a/public/views/slide.ejs b/public/views/slide.ejs
index 3178fc9..26c38bb 100644
--- a/public/views/slide.ejs
+++ b/public/views/slide.ejs
@@ -37,13 +37,13 @@
         <link rel="stylesheet" href="<%- url %>/css/slide.css">
 
         <!-- Printing and PDF exports -->
-		<script>
-			var link = document.createElement( 'link' );
-			link.rel = 'stylesheet';
-			link.type = 'text/css';
+        <script>
+            var link = document.createElement( 'link' );
+            link.rel = 'stylesheet';
+            link.type = 'text/css';
             link.href = '<%- url %>/build/reveal.js/' + (window.location.search.match( /print-pdf/gi ) ? 'css/print/pdf.css' : 'css/print/paper.css');
-			document.getElementsByTagName( 'head' )[0].appendChild( link );
-		</script>
+            document.getElementsByTagName( 'head' )[0].appendChild( link );
+        </script>
 
         <%- include shared/polyfill %>
     </head>