diff --git a/README.md b/README.md
index d86448a..3480791 100644
--- a/README.md
+++ b/README.md
@@ -116,6 +116,8 @@ paginate = 5
     menuMore = "Show more"
     readMore = "Read more"
     readOtherPosts = "Read other posts"
+    missingContentMessage = "Page not found."
+    missingBackButtonLabel = "Go Back"
 
     [languages.en.params.logo]
       logoText = "Terminal"
diff --git a/layouts/404.html b/layouts/404.html
new file mode 100644
index 0000000..d69471a
--- /dev/null
+++ b/layouts/404.html
@@ -0,0 +1,11 @@
+{{ define "main" }}
+<div class="post">
+  <h1 class="post-title">404!</h1>
+
+  <div class="post-content">
+    {{ .Site.Params.missingContentMessage }}<br>
+    <a href="{{ "/" | absURL }}">{{ .Site.Params.missingBackButtonLabel }}&nbsp;→</a>
+  </div>
+
+</div>
+{{ end }}