improve appearance

layouts/404.html

@@ -1,9 +1,17 @@
 {{ define "main" }}
-  <h1>404 Not Found</h1>
-  <p>The page you requested cannot be found.</p>
-  <p>
-    <a href="{{ .Site.Home.RelPermalink }}">
-      Return to the home page
-    </a>
-  </p>
-{{ end }}
+
+  <div id="page-header">
+    <h1>Oh No!</h1>
+    <span class="subtitle">This is not the page you are looking for.</span>
+  </div>
+
+  <section>
+  <p>This is really embarrassing, but the page you were looking for does not exist. It may have been moved or deleted.</p>
+  <p>Please <a href="https://gitmoss.fyi/fmtools/content/issues/new" target="_blank">submit an issue</a> if you think this is a mistake, or you can go back to the <a href="{{ "/" | relLangURL }}">home page</a>.</p>
+  </section>
+
+  <!-- {{ $dateMachine := .Date | time.Format "2006-01-02T15:04:05-07:00" }}
+  {{ $dateHuman := .Date | time.Format ":date_long" }}
+  <p class="time">Updated <time datetime="{{ $dateMachine }}">{{ $dateHuman }}</time></p> -->
+
+{{ end }}