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-  { position: absolute; }
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-pre.numberSource { margin-left: 3em; border-left: 1px solid #aaaaaa;  padding-left: 4px; }
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-</style>
-
-<link rel="stylesheet" href="style.css" type="text/css" />
-</head>
-
-<body>
-
-
-
-  <div class="book without-animation with-summary font-size-2 font-family-1" data-basepath=".">
-
-    <div class="book-summary">
-      <nav role="navigation">
-
-<ul class="summary">
-<li class="chapter" data-level="1" data-path="index.html"><a href="index.html"><i class="fa fa-check"></i><b>1</b> Introduction</a></li>
-<li class="chapter" data-level="2" data-path="cross-format-tables-in-bookdown.html"><a href="cross-format-tables-in-bookdown.html"><i class="fa fa-check"></i><b>2</b> Cross-format Tables in Bookdown</a><ul>
-<li class="chapter" data-level="2.1" data-path="cross-format-tables-in-bookdown.html"><a href="cross-format-tables-in-bookdown.html#use-the-k-m-approach-instead-of-m-k"><i class="fa fa-check"></i><b>2.1</b> Use the “K-M” approach instead of “M-K”</a></li>
-<li class="chapter" data-level="2.2" data-path="cross-format-tables-in-bookdown.html"><a href="cross-format-tables-in-bookdown.html#prepare-your-tables-for-both-formats"><i class="fa fa-check"></i><b>2.2</b> Prepare Your Tables for Both Formats</a></li>
-</ul></li>
-<li class="chapter" data-level="3" data-path="use-bootstrap-tables-in-gitbooks.html"><a href="use-bootstrap-tables-in-gitbooks.html"><i class="fa fa-check"></i><b>3</b> Use Bootstrap Tables in gitbooks</a></li>
-</ul>
-
-      </nav>
-    </div>
-
-    <div class="book-body">
-      <div class="body-inner">
-        <div class="book-header" role="navigation">
-          <h1>
-            <i class="fa fa-circle-o-notch fa-spin"></i><a href="./">Using kableExtra in Bookdown Projects</a>
-          </h1>
-        </div>
-
-        <div class="page-wrapper" tabindex="-1" role="main">
-          <div class="page-inner">
-
-            <section class="normal" id="section-">
-<div id="use-bootstrap-tables-in-gitbooks" class="section level1">
-<h1><span class="header-section-number">Chapter 3</span> Use Bootstrap Tables in gitbooks</h1>
-<p>Most of <code>kableExtra</code> tricks will work in <code>bookdown</code> except those requires <a href="http://getbootstrap.com/"><code>bootstrap</code></a>. By default, <code>rmarkdown</code> won’t load <code>bootstrap</code> for you on gitbook as there are potential conflict.</p>
-<pre class="sourceCode r"><code class="sourceCode r"><span class="kw">library</span>(kableExtra)
-<span class="kw">options</span>(<span class="dt">kableExtra.html.bsTable =</span> T)
-
-mtcars[<span class="dv">1</span><span class="op">:</span><span class="dv">5</span>, <span class="dv">1</span><span class="op">:</span><span class="dv">5</span>] <span class="op">%&gt;%</span>
-<span class="st">  </span><span class="kw">kable</span>(<span class="dt">booktabs =</span> T) <span class="op">%&gt;%</span><span class="st"> </span>
-<span class="st">  </span><span class="kw">kable_styling</span>(
-    <span class="dt">bootstrap_options =</span> <span class="kw">c</span>(<span class="st">&quot;striped&quot;</span>, <span class="st">&quot;bordered&quot;</span>),
-    <span class="dt">latex_options =</span> <span class="kw">c</span>(<span class="st">&quot;striped&quot;</span>),
-    <span class="dt">full_width =</span> F
-  ) <span class="op">%&gt;%</span>
-<span class="st">  </span><span class="kw">column_spec</span>(<span class="dv">1</span>, <span class="dt">color =</span> <span class="st">&quot;red&quot;</span>) <span class="op">%&gt;%</span>
-<span class="st">  </span><span class="kw">add_header_above</span>(<span class="kw">c</span>(<span class="st">&quot; &quot;</span>, <span class="st">&quot;Group A&quot;</span> =<span class="st"> </span><span class="dv">2</span>, <span class="st">&quot;Group B&quot;</span> =<span class="st"> </span><span class="dv">3</span>))</code></pre>
-<table class="table table-striped table-bordered" style="width: auto !important; margin-left: auto; margin-right: auto;">
-<thead>
-<tr>
-<th style="border-bottom:hidden" colspan="1">
-</th>
-<th style="border-bottom:hidden; padding-bottom:0; padding-left:3px;padding-right:3px;text-align: center; " colspan="2">
-<div style="border-bottom: 1px solid #ddd; padding-bottom: 5px; ">
-Group A
-</div>
-</th>
-<th style="border-bottom:hidden; padding-bottom:0; padding-left:3px;padding-right:3px;text-align: center; " colspan="3">
-<div style="border-bottom: 1px solid #ddd; padding-bottom: 5px; ">
-Group B
-</div>
-</th>
-</tr>
-<tr>
-<th style="text-align:left;">
-</th>
-<th style="text-align:right;">
-mpg
-</th>
-<th style="text-align:right;">
-cyl
-</th>
-<th style="text-align:right;">
-disp
-</th>
-<th style="text-align:right;">
-hp
-</th>
-<th style="text-align:right;">
-drat
-</th>
-</tr>
-</thead>
-<tbody>
-<tr>
-<td style="text-align:left;color: red;">
-Mazda RX4
-</td>
-<td style="text-align:right;">
-21.0
-</td>
-<td style="text-align:right;">
-6
-</td>
-<td style="text-align:right;">
-160
-</td>
-<td style="text-align:right;">
-110
-</td>
-<td style="text-align:right;">
-3.90
-</td>
-</tr>
-<tr>
-<td style="text-align:left;color: red;">
-Mazda RX4 Wag
-</td>
-<td style="text-align:right;">
-21.0
-</td>
-<td style="text-align:right;">
-6
-</td>
-<td style="text-align:right;">
-160
-</td>
-<td style="text-align:right;">
-110
-</td>
-<td style="text-align:right;">
-3.90
-</td>
-</tr>
-<tr>
-<td style="text-align:left;color: red;">
-Datsun 710
-</td>
-<td style="text-align:right;">
-22.8
-</td>
-<td style="text-align:right;">
-4
-</td>
-<td style="text-align:right;">
-108
-</td>
-<td style="text-align:right;">
-93
-</td>
-<td style="text-align:right;">
-3.85
-</td>
-</tr>
-<tr>
-<td style="text-align:left;color: red;">
-Hornet 4 Drive
-</td>
-<td style="text-align:right;">
-21.4
-</td>
-<td style="text-align:right;">
-6
-</td>
-<td style="text-align:right;">
-258
-</td>
-<td style="text-align:right;">
-110
-</td>
-<td style="text-align:right;">
-3.08
-</td>
-</tr>
-<tr>
-<td style="text-align:left;color: red;">
-Hornet Sportabout
-</td>
-<td style="text-align:right;">
-18.7
-</td>
-<td style="text-align:right;">
-8
-</td>
-<td style="text-align:right;">
-360
-</td>
-<td style="text-align:right;">
-175
-</td>
-<td style="text-align:right;">
-3.15
-</td>
-</tr>
-</tbody>
-</table>
-
-</div>
-            </section>
-
-          </div>
-        </div>
-      </div>
-<a href="cross-format-tables-in-bookdown.html" class="navigation navigation-prev navigation-unique" aria-label="Previous page"><i class="fa fa-angle-left"></i></a>
-
-    </div>
-  </div>
-<script src="libs/gitbook-2.6.7/js/app.min.js"></script>
-<script src="libs/gitbook-2.6.7/js/lunr.js"></script>
-<script src="libs/gitbook-2.6.7/js/plugin-search.js"></script>
-<script src="libs/gitbook-2.6.7/js/plugin-sharing.js"></script>
-<script src="libs/gitbook-2.6.7/js/plugin-fontsettings.js"></script>
-<script src="libs/gitbook-2.6.7/js/plugin-bookdown.js"></script>
-<script src="libs/gitbook-2.6.7/js/jquery.highlight.js"></script>
-<script>
-gitbook.require(["gitbook"], function(gitbook) {
-gitbook.start({
-"sharing": {
-"github": false,
-"facebook": true,
-"twitter": true,
-"google": false,
-"linkedin": false,
-"weibo": false,
-"instapper": false,
-"vk": false,
-"all": ["facebook", "google", "twitter", "linkedin", "weibo", "instapaper"]
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-"fontsettings": {
-"theme": "white",
-"family": "sans",
-"size": 2
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-"edit": {
-"link": null,
-"text": null
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-"download": ["bookdown_example.pdf", "bookdown_example.epub"],
-"toc": {
-"collapse": "subsection"
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-});
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diff --git a/docs/bookdown_example/_bookdown.yml b/docs/bookdown_example/_bookdown.yml
index a189c96..d6b79b4 100644
--- a/docs/bookdown_example/_bookdown.yml
+++ b/docs/bookdown_example/_bookdown.yml
@@ -1,6 +1,7 @@
 book_filename: "bookdown_example"
 delete_merged_file: true
 new_session: true
+output_dir: "../bookdown"
 language:
   ui:
     chapter_name: "Chapter "