first adaption to suit my needs

_includes/footer.html

@@ -3,6 +3,6 @@
 		{{site.data.extra.list.footer_bio}}
 	</p>
 	<p>
-		&copy 2019 | {{site.title}}
+		20XX | {{site.title}}
 	</p>
 </footer>

_includes/head.html

@@ -5,4 +5,6 @@
 	<title>{{site.title}} | {{page.title}}</title>
 	<link rel="stylesheet" href="{{site.baseurl}}/assets/css/mark.css" />
 	<link rel="stylesheet" href="{{site.baseurl}}/assets/css/custom.css" />
+	<link rel="stylesheet" href="{{site.baseurl}}/assets/css/crt.css" />
+
 </head>

_includes/header.html

@@ -1,5 +1,5 @@
 <header>
-	<a href="{{site.baseurl}}/">
+	<a href=".">
 		<h3>{{site.title}}</h3>
 	</a>
 </header>

_includes/nav.html

@@ -1,5 +1,5 @@
 <nav>
 	{% for item in site.data.nav.list %}
-	<a href="{{site.baseurl}}/{{item.url}}">{{item.title}}</a>
+	<a href="{{site.baseurl}}{{item.url}}"{% if page.url == item.url %} class="a-active" {% endif %}>{{item.title}}</a>
 	{% endfor %}
 </nav>