diff --git a/_includes/navigation.html b/_includes/navigation.html
index ab853aa3cd3a3358144b0f60920751a5890d53a1..2e0739da8e242653ef4cf1f528af5dcdf8510848 100644
--- a/_includes/navigation.html
+++ b/_includes/navigation.html
@@ -1,5 +1,5 @@
 <nav>
   {% for item in site.data.navigation %}
-    <a href="{{ item.link }}" {% if page.url == item.link %}class="current"{% endif %}>{{ item.name }}</a>
+    <a href="{{ item.link | real_relative_url }}" {% if page.url == item.link %}class="current"{% endif %}>{{ item.name }}</a>
   {% endfor %}
 </nav>
diff --git a/_layouts/default.html b/_layouts/default.html
index ceef12e07b7168089b1b398c2aa59e9fc2c23eb7..2b0a996c29d8bffe660756beb87924678970f190 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -3,7 +3,7 @@
   <head>
     <meta charset="utf-8">
     <title>{{ page.title }}</title>
-    <link rel="stylesheet" href="/assets/css/styles.css">
+    <link rel="stylesheet" href="{{ "/assets/css/styles.css" | real_relative_url }}">
     {% include mathjax.html %}
   </head>
   <body>
diff --git a/_plugins/real_relative_url.rb b/_plugins/real_relative_url.rb
new file mode 100644
index 0000000000000000000000000000000000000000..37ceb8c3f5c24eb43a650f2701b6037ca89d4af4
--- /dev/null
+++ b/_plugins/real_relative_url.rb
@@ -0,0 +1,17 @@
+require 'pathname'
+
+# Jekyll's built-in "relative_url" filter does not generate relative URLs, it generates URLs that
+# don't contain the domain. This plugin was posted to a GitHub issue in which @aioobe asks about
+# making real relative URLs: https://github.com/jekyll/jekyll/issues/6360.
+
+module Jekyll
+  module RealRelativeUrl
+    def real_relative_url(url)
+      pageUrl = @context.registers[:page]["url"]
+      pageDir = Pathname(pageUrl).parent
+      Pathname(url).relative_path_from(pageDir).to_s
+    end
+  end
+end
+
+Liquid::Template.register_filter(Jekyll::RealRelativeUrl)
diff --git a/_sass/main.scss b/_sass/main.scss
index bc25e9ec345e7f25206a42139085669d4ad800b9..9ecbc411044de9c0a2a0ce4c9e1a10bd49e941e9 100644
--- a/_sass/main.scss
+++ b/_sass/main.scss
@@ -1,3 +1,3 @@
 .current {
-  color: green;
+  font-weight: bold;
 }