Highlight external links.
diff --git a/org.jacoco.doc/docroot/doc/implementation.html b/org.jacoco.doc/docroot/doc/implementation.html
index 3f9b70b..b9b6b7a 100644
--- a/org.jacoco.doc/docroot/doc/implementation.html
+++ b/org.jacoco.doc/docroot/doc/implementation.html
@@ -13,6 +13,7 @@
<a href="index.html" class="el_group">Documentation</a> >
<span class="el_source">Implementation Design</span>
</div>
+<div id="content">
<h1>Implementation Design</h1>
@@ -306,6 +307,7 @@
bundles can also be used like regular JAR files.
</p>
+</div>
<div class="footer">
<div class="versioninfo"><a href="@HOMEURL@">JaCoCo</a> @VERSION@</div>
<a href="license.html">Copyright</a> © 2009, 2010 Mountainminds GmbH & Co. KG and Contributors